For most of the last decade, the answer to “where should I spend my marketplace ad dollars?” was simple: Amazon, full stop. But in 2026, that calculus is genuinely complicated. Walmart Connect has posted three consecutive quarters of 30%-plus ad revenue growth, its CPCs remain roughly 40–60% cheaper than comparable Amazon placements, and its Luminate first-party data layer is giving sophisticated brands a targeting edge they didn’t have 18 months ago. Meanwhile, Amazon Ads continues to dominate by sheer scale — $56.2B in ad revenue in 2025, per the company’s Q4 earnings — but rising Sponsored Products CPCs, tighter brand control restrictions, and a more crowded auction are forcing sellers to ask hard questions about allocation.
This comparison is for operators who are already running on both platforms or actively deciding how to weight their budgets. We’ll look at audience scale, ad product depth, data infrastructure, cost efficiency, and where each platform is heading in the second half of 2026.
How does audience scale actually compare between Amazon Ads and Walmart Connect?
Scale is still Amazon’s trump card. Amazon reaches approximately 230 million unique monthly U.S. shoppers, with an intent density that no other retail media network can match. When a shopper is on Amazon, they are almost always in purchase mode. That high-intent traffic is what justifies Amazon’s CPCs, which averaged $1.40–$2.20 for Sponsored Products in competitive categories as of Q1 2026, per Pacvue’s quarterly benchmark report.
Walmart’s logged-in shopper base sits at roughly 145 million monthly active U.S. users across Walmart.com and the Walmart app, boosted significantly by Walmart+ membership growth, which crossed 32 million subscribers in early 2026. The crucial nuance: Walmart’s audience skews toward grocery and household staples buyers, with stronger penetration in suburban and rural zip codes that are underrepresented in Amazon’s core demographic. For brands in CPG, home goods, and seasonal categories, that audience profile is genuinely additive, not redundant.
- Amazon: ~230M U.S. monthly shoppers, high purchase intent, urban/suburban skew
- Walmart Connect: ~145M U.S. monthly users, strong grocery + household staples signal, suburban/rural penetration
- Walmart+: 32M+ subscribers generating richer behavioral data for Luminate targeting
Which platform offers better ad product depth and targeting flexibility?
Amazon’s ad stack is more mature by several years. Sponsored Products, Sponsored Brands, Sponsored Display, DSP, and Amazon Marketing Cloud (AMC) give sellers and agencies a full funnel to work with. AMC in particular has become a serious tool for large-scale sellers: it allows SQL-based audience analysis across first-party purchase data, enabling custom attribution modeling that most platforms can’t replicate.
“AMC is where the real leverage is in 2026,” says Andrew Lipsman, independent retail media analyst and former eMarketer principal. “Brands that are building custom AMC audiences and feeding them into DSP are running laps around everyone still operating at the keyword-bid level.”
“AMC is where the real leverage is in 2026. Brands that are building custom AMC audiences and feeding them into DSP are running laps around everyone still operating at the keyword-bid level.” — Andrew Lipsman, retail media analyst
Walmart Connect’s ad product suite has caught up meaningfully. Sponsored Products, Sponsored Brands (now including video), and Display are all live and self-serve. The bigger 2026 story is Walmart’s Luminate platform, which gives advertisers access to purchase behavior, basket composition, and loyalty segment data that didn’t exist in the Walmart ad ecosystem two years ago. Walmart also expanded its off-site DSP capabilities in Q1 2026, letting brands retarget Walmart shoppers across the open web — a direct challenge to Amazon’s DSP value proposition.
- Amazon: Sponsored Products, Sponsored Brands, Sponsored Display, DSP, AMC (SQL-layer analytics), video, audio
- Walmart Connect: Sponsored Products, Sponsored Brands (with video), Display, off-site DSP, Luminate data layer, in-store integration
Which platform delivers better ROAS and cost efficiency in 2026?
This is where Walmart Connect makes its most compelling case. Average CPCs on Walmart Sponsored Products ranged from $0.55–$0.95 in Q1 2026 for mid-tier categories, per Tinuiti’s retail media benchmark report released in April 2026. That’s roughly 40–55% cheaper than equivalent Amazon placements. For brands with healthy margins who are willing to invest in Walmart catalog optimization, the return on ad spend numbers can be striking in less competitive verticals.
That said, conversion rates tell a more complicated story. Amazon’s category conversion rates average 10–15% for Sponsored Products clicks in many verticals. Walmart’s comparable metric sits closer to 5–8%, reflecting a less purchase-intent-saturated environment. Higher ROAS on Walmart often requires deeper catalog investment — better content scores, more reviews, Buy Box ownership — before ad dollars really compound.
“We cut our Walmart Connect CPCs by 38% versus Amazon equivalents, but we had to spend three months getting our content scores above 90 before the ROAS started to make sense. The platform rewards catalog hygiene in a way sellers don’t always account for.” — Sarah Hoffmann, VP of Marketplace Strategy at Grove Collaborative
For Amazon, the 2026 concern is CPC inflation. Sponsored Products CPCs in beauty, supplements, and home categories have risen 18–24% year-over-year, driven by brand registry expansion and increased participation from overseas sellers. Sellers running lean on margin — particularly in furniture, electronics, and apparel — are feeling the squeeze acutely.
How do Amazon Ads and Walmart Connect compare on data and attribution?
Amazon’s data moat remains the widest in retail media. Purchase history across hundreds of millions of customers, tied to search behavior, streaming (Prime Video), and Alexa data, gives Amazon an attribution and targeting infrastructure that is genuinely difficult to replicate. Amazon Marketing Cloud lets sophisticated advertisers stitch together impression-to-conversion paths across the full funnel with a level of granularity that agencies like Tinuiti, Pacvue, and Perpetua have built entire service practices around.
Walmart’s Luminate is a credible challenger but earlier in its maturity curve. It launched broadly in 2023 and has been progressively unlocking richer data segments. As of Q2 2026, Luminate offers purchase-based audience segments, loyalty tier targeting, basket affinity data, and — critically — in-store behavioral signals from Walmart’s 4,700 U.S. stores, which Amazon simply cannot access. For brands with both an online and in-store Walmart presence, that omnichannel signal is genuinely valuable.
- Amazon: AMC SQL analytics, DSP audience modeling, cross-channel signal (search, streaming, Alexa), mature third-party tooling (Pacvue, Perpetua, Intentwise)
- Walmart Connect: Luminate purchase + basket data, in-store behavioral signals, off-site retargeting DSP, maturing but less third-party tool coverage
Which platform has better managed service and agency infrastructure?
Amazon Ads has a dramatically deeper agency ecosystem. Every major performance marketing agency — Tinuiti, Jellyfish, Acadia, Marketplace Valet, Envision Horizons — has a dedicated Amazon practice with tooling, playbooks, and staffing built around the platform. Software infrastructure from Pacvue, Perpetua, Intentwise, and Scale Insights gives sellers granular bid automation and reporting. Amazon’s own managed service team (for accounts spending $50K+/month) has also improved its responsiveness after criticism in 2024.
Walmart Connect’s managed service offering is more limited but improving. Walmart’s internal Connect team has been proactively reaching out to high-GMV sellers with dedicated support, and agencies like Tinuiti and Flywheel have built Walmart-specific practices. Third-party tooling is thinner — Pacvue and Perpetua both support Walmart campaigns, but the feature depth doesn’t match their Amazon counterparts yet.
“The tooling gap between Amazon and Walmart is closing but it’s still real,” says Mike Feldman, SVP of Retail Media at Publicis Commerce. “We’re running sophisticated Walmart campaigns for major CPG clients, but we’re still doing more manual optimization than we’d like. The AMC equivalent for Walmart isn’t fully there yet.”
“The tooling gap between Amazon and Walmart is closing but it’s still real. We’re running sophisticated Walmart campaigns for major CPG clients, but we’re still doing more manual optimization than we’d like.” — Mike Feldman, SVP of Retail Media, Publicis Commerce
Which platform should you prioritize in your 2026 marketplace ad budget?
The honest answer is category-dependent. For most sellers, Amazon remains the primary platform — the audience scale, purchase intent, and mature tooling infrastructure make it the default allocation for sellers optimizing for revenue efficiency. But the sellers leaving Walmart Connect money on the table are increasingly the exception, not the norm.
The practical 2026 allocation framework used by larger multi-marketplace brands: 65–75% of retail media budget to Amazon, 20–25% to Walmart Connect, with the remainder split between Target’s Roundel and emerging retail media networks. Brands in CPG, household goods, and seasonal categories are skewing that Walmart number higher, particularly as Luminate matures and off-site DSP capabilities expand.
| Factor | Amazon Ads | Walmart Connect |
|---|---|---|
| 2025 Ad Revenue | $56.2B | ~$4.4B (est.) |
| Monthly U.S. Shoppers | ~230M | ~145M |
| Avg. Sponsored Products CPC (Q1 2026) | $1.40–$2.20 | $0.55–$0.95 |
| Avg. Sponsored Products CVR | 10–15% | 5–8% |
| Ad Product Maturity | High (full funnel + DSP + AMC) | Medium (growing fast) |
| First-Party Data Layer | Amazon Marketing Cloud | Luminate (purchase + in-store) |
| In-Store Signal Integration | No | Yes (4,700 U.S. stores) |
| Third-Party Tool Ecosystem | Deep (Pacvue, Perpetua, Intentwise, Scale Insights) | Growing (Pacvue, Perpetua, limited) |
| Best For | High-intent search, full-funnel brand building, most categories | CPG, household goods, budget-sensitive scaling, omnichannel brands |
| Recommended Budget Weight | 65–75% of retail media budget | 20–25% of retail media budget |
The bottom line for operators: Amazon Ads wins on scale, tooling depth, and conversion efficiency. Walmart Connect wins on CPC efficiency, in-store data integration, and audience differentiation. In 2026, the most competitive sellers aren’t choosing — they’re running both, optimizing catalog quality on Walmart to close the conversion gap, and using Luminate’s in-store signals to inform creative and audience decisions that echo back into their Amazon strategy. The question is no longer Amazon or Walmart. It’s how fast you can build the operational muscle to run both intelligently.
