Amazon Ads vs. Walmart Connect in 2026: Which Retail Media Network Wins?

For most of ecommerce’s modern era, Amazon Advertising was the only retail media network that truly mattered at scale. Everything else was a rounding error. That calculus is shifting — not dramatically, but enough that brand operators, agency media buyers, and DTC founders are running genuine A/B tests on where to put incremental ad dollars in the second half of 2026.

Walmart Connect crossed $6.1 billion in U.S. advertising revenue in fiscal year 2026, according to Walmart’s May earnings release, representing 28% year-over-year growth. Amazon’s ad services segment, by contrast, posted $56.2 billion globally in the trailing twelve months — still nearly ten times larger — but domestic growth has decelerated to roughly 14% as platform saturation and rising CPCs erode mid-tier seller ROI. The gap is closing, slowly, and the trajectory matters more than the snapshot.

This is a head-to-head of two real, operating retail media ecosystems. Here is what the data and operators on the ground actually say.

How do Amazon Ads and Walmart Connect differ in scale and reach?

Amazon’s advertising infrastructure spans Sponsored Products, Sponsored Brands, Sponsored Display, DSP, and a growing off-site network that includes Fire TV, Twitch, and third-party programmatic inventory. The platform serves roughly 310 million active customer accounts globally and processes more than 4.5 billion product searches per month in the U.S. alone. That addressable intent pool is, by any measure, unmatched in retail media.

Walmart Connect operates at a different but still substantial scale. Walmart.com attracts approximately 120 million unique monthly visitors in the U.S., supported by 4,600-plus physical store locations that feed omnichannel attribution data most pure-play digital networks cannot replicate. Walmart’s in-store media — self-checkout screens, digital endcaps, Walmart Radio — adds a physical touchpoint layer that Amazon structurally cannot match.

“The in-store signal is the piece that gets underweighted in every media plan I’ve seen. When a Walmart Connect campaign can connect a Sponsored Search click to a store pickup scan 48 hours later, that’s a closed loop Amazon simply doesn’t have.” — Melissa Hargrove, VP of Retail Media, Tinuiti

For pure digital reach and search intent volume, Amazon wins by a wide margin. For omnichannel attribution in grocery, general merchandise, and mass-market CPG, Walmart Connect is increasingly the more credible measurement story.

Which platform delivers stronger ROAS for sponsored search advertisers?

Benchmark data from Pacvue’s Q1 2026 Retail Media Report shows average Sponsored Products ROAS on Amazon at 3.8x across all categories, down from 4.2x in Q1 2025. CPC inflation — particularly in beauty, supplements, and home goods — is the primary driver. Average CPCs in competitive Amazon categories now range from $1.80 to $4.20, with electronics and apparel trending higher.

Walmart Connect Sponsored Products averaged 4.1x ROAS in the same Pacvue data set, but with an important caveat: the sample size is smaller and Walmart’s auction inventory is thinner, meaning high-volume spenders frequently encounter impression caps that limit scalability. Brands spending above $50,000 per month on Walmart Connect routinely report difficulty deploying full budgets efficiently.

• Amazon Sponsored Products avg. CPC: $1.80–$4.20 (Q1 2026, varies by category)
• Walmart Connect Sponsored Products avg. CPC: $0.65–$1.40 (Q1 2026)
• Amazon avg. ROAS across categories: 3.8x (Pacvue, Q1 2026)
• Walmart Connect avg. ROAS across categories: 4.1x (Pacvue, Q1 2026)
• Amazon DSP minimum spend: $35,000/month managed service
• Walmart Connect DSP minimum spend: $25,000/month managed service

The ROAS premium on Walmart Connect reflects lower auction competition, not superior platform mechanics. As more brands move budget there — which is happening — CPCs will rise and that gap will compress. Early movers in 2025 and early 2026 captured meaningful efficiency advantages that are already beginning to erode in high-velocity categories like pet food and household consumables.

How do the ad tech and campaign management tools compare?

Amazon’s ad console has matured into a genuinely capable self-serve platform. Bulk operations, dayparting, placement modifiers, and automated bidding rules are all native. Third-party tools — Perpetua, Pacvue, Intentwise, Scale Insights — integrate deeply via Amazon’s Advertising API and give sophisticated sellers campaign automation that rivals enterprise DSP interfaces.

Walmart Connect’s self-serve console, rebuilt on a new infrastructure stack in late 2025, has closed meaningful product gaps. Campaign creation, keyword harvesting, and basic bid management are now comparable to Amazon’s experience circa 2022. But the API ecosystem is thinner: fewer third-party tools support Walmart Connect with full feature parity, and attribution reporting still lags Amazon’s by approximately 72 hours in the standard dashboard.

“We run Pacvue across both platforms, and the Walmart data is cleaner than it was 18 months ago, but the attribution window flexibility on Amazon is still meaningfully better. That matters when you’re trying to optimize mid-flight on a promotional event.” — Jason Brill, Head of Marketplace Strategy, Pattern

Walmart Connect’s newer advantage is its integration with The Trade Desk, formalized through a 2025 partnership that gives programmatic buyers access to Walmart’s first-party shopper data — 90 million active loyalty members via Walmart+ — through a non-walled-garden environment. That data clean room access, built on Snowflake, is something Amazon has historically been reluctant to offer outside its own DSP.

Which platform wins for brand discovery versus conversion campaigns?

The honest answer is that they serve different stages of the funnel with different levels of efficiency, and smart operators are running both rather than choosing one.

Amazon’s Sponsored Brands Video and Streaming TV ads — the latter now available to sellers spending as little as $10,000/month — make it a viable upper-funnel channel for mid-market DTC brands that previously couldn’t afford connected TV. Amazon DSP’s off-site reach, particularly via Fire TV’s 80 million active devices, adds incremental awareness inventory that converts with measurable attribution back to Amazon detail page visits.

Walmart Connect’s upper-funnel story is built around in-store media and Walmart+ member targeting. For a CPG brand launching a new SKU in mass retail, the ability to run a Walmart Connect display campaign that targets Walmart+ members who bought a competitive product in the last 90 days — and then measure lift against in-store scans — is a closed-loop attribution model that legacy national TV spend could never deliver.

• Best for high-intent sponsored search: Amazon (scale advantage)
• Best for lower-CPC discovery: Walmart Connect (for now)
• Best for omnichannel attribution (digital + in-store): Walmart Connect
• Best for streaming/CTV inventory: Amazon (Fire TV, Freevee)
• Best for programmatic third-party data access: Walmart Connect (via The Trade Desk)
• Best for category depth (long-tail SKUs): Amazon

What do the financials say about where advertiser dollars are actually going?

eMarketer’s June 2026 U.S. Retail Media Forecast projects Amazon will hold 73.4% of domestic retail media ad spend in 2026, down from 76.1% in 2024. Walmart Connect’s share is projected at 9.2%, up from 6.8% two years prior. Kroger Precision Marketing, Instacart Ads, and Target’s Roundel collectively account for most of the remaining share, with none individually exceeding 4.5%.

The budget shift is real but measured. Agency holding companies report that brands are typically reallocating 8–15% of their Amazon ad budget to Walmart Connect as a test — not a wholesale migration. The trigger is usually a new Walmart distribution win or a promotional event like Walmart+ Week (now a bi-annual event after its June and November editions were both revenue-positive for advertisers in 2025).

“Nobody is abandoning Amazon. The intent signal is too strong and the catalog depth is too big. What’s changing is that CFOs are asking why 100% of retail media dollars go to one vendor when Walmart’s ROAS metrics are competitive and the audience doesn’t fully overlap.” — David Spitz, CEO, ChannelAdvisor (now part of CommerceHub)

For brands with significant Walmart.com GMV — particularly in consumables, apparel, and home — the business case for Walmart Connect spend is straightforward. For digitally native brands with no Walmart distribution, Amazon Ads remains the default, and Walmart Connect’s minimum spend thresholds make exploratory buys less attractive without existing sales velocity on the platform to anchor attribution.

Which platform should operators prioritize in Q3–Q4 2026?

The framing of “Amazon vs. Walmart Connect” is, in practice, a false binary for any brand operating at meaningful scale on both marketplaces. The operational reality in 2026 is that the two networks have low audience overlap — Walmart’s shopper base skews older, lower-income, and more geographically distributed across non-coastal markets — which makes them genuinely complementary rather than substitutable.

That said, if budget is constrained and a brand must prioritize, the decision tree is fairly clean. Amazon Ads wins for: digital-only brands, high-SKU-count catalogs, brands where search intent drives the majority of sales, and any brand not yet sold on Walmart.com. Walmart Connect wins for: mass-market CPG with active Walmart distribution, brands targeting value-oriented consumers, advertisers with physical retail ambitions, and media buyers who need to demonstrate omnichannel attribution to a CFO.

For Q4 2026 specifically, Walmart Connect’s Black Friday and Cyber Monday inventory is expected to be significantly more competitive — and more expensive — than in prior years, as Walmart projects online GMV of $32 billion for November–December 2026, up 19% year-over-year. Early commitments for Q4 premium placements are reportedly already sold out for top-100 Walmart suppliers as of this writing.

The bottom line: Amazon Advertising remains the dominant force in retail media by every quantitative measure that matters. But Walmart Connect has closed enough product, data, and scale gaps to warrant serious allocation from any brand with meaningful Walmart distribution — and its in-store attribution capability is genuinely differentiated. The brands that treat these networks as complementary rather than competing are consistently outperforming peers who put all their retail media eggs in one basket.