Amazon Ads vs. Walmart Connect in 2026: Where Should Your Budget Go?

For the better part of a decade, the conversation around retail media was simple: spend on Amazon, optimize ACOS, repeat. But Walmart Connect’s aggressive infrastructure buildout — combined with its Q1 2026 disclosure of $4.5 billion in annual ad revenue — has forced even the most Amazon-native brands to run a genuine platform comparison. The question isn’t whether Amazon Ads is powerful. It is. The question is whether Walmart Connect has matured enough to earn a meaningful budget allocation, and under what conditions the math actually works.

We broke down both platforms across reach, targeting depth, ad formats, attribution, and total cost of engagement — using real merchant data and recent platform disclosures — to give operators a cleaner picture heading into H2 2026 planning.

What Does Each Platform’s Reach Actually Look Like in 2026?

Amazon’s retail media network remains the largest in the world by a significant margin. Amazon Ads reached an estimated 157 million unique U.S. shoppers monthly as of Q1 2026, according to eMarketer. Amazon’s advertising services revenue hit $56.2 billion in 2025 — up 18% year-over-year — and the company commands roughly 75% of all U.S. retail media spend.

Walmart Connect’s reach is narrower but increasingly meaningful. Walmart’s U.S. ecommerce sales grew 22% YoY in FY2026, and the retailer now claims over 120 million unique monthly visitors across Walmart.com and the Walmart app. More importantly, Walmart’s shopper base skews toward high-frequency, value-oriented buyers — a demographic that has proven receptive to CPG, private label, and household consumables. For brands in those categories, the reach gap with Amazon is less damaging than the raw numbers suggest.

“The reach delta between Amazon and Walmart is real, but it’s not the only number that matters. We’re seeing CPCs on Walmart Connect run 30 to 40 percent below equivalent Amazon placements, and conversion rates in grocery and consumables are tracking within 10 points of Amazon. For our clients in those verticals, ignoring Walmart is leaving real margin on the table.” — Caitlin Morse, VP of Retail Media, Tinuiti

💡 Article Summary

Key Insights

1

What Does Each Platform’s Reach Actually Look Like in 2026?

2

How Do the Targeting and Data Capabilities Compare?

3

What Ad Formats Are Available on Each Platform?

4

How Does Attribution Work — and Where Does Each Platform Fall Short?

5

Which Verticals and Seller Types Does Each Platform Favor?

Source: Ecommerce Times

How Do the Targeting and Data Capabilities Compare?

This is where Amazon’s structural advantage is hardest to close. Amazon’s DSP gives advertisers access to first-party purchase intent data spanning hundreds of millions of SKUs, 20+ years of behavioral signals, and the ability to retarget shoppers off-Amazon across display, streaming TV, and audio. Amazon Marketing Cloud (AMC) now supports SQL-based custom audience analysis that sophisticated operators are using to model lifetime value cohorts and cross-category purchase sequences.

Walmart Connect launched its own clean room product — Walmart Luminate — in 2024, and the platform has iterated meaningfully since. As of June 2026, Luminate gives advertisers access to basket-level purchase data, shopper segmentation by store cluster, and limited off-site retargeting via The Trade Desk integration. It’s a credible first-party data stack, but the query depth and flexibility still lag AMC by 18 to 24 months in most practitioners’ assessments.

• Amazon DSP: Off-site display, OTT/streaming (via Amazon Freevee and Thursday Night Football), audio, and custom AMC audiences
• Walmart Connect DSP: Off-site display via The Trade Desk integration, limited streaming inventory, improving but still narrow
• Sponsored Products: Both platforms offer keyword and ASIN-level targeting; Amazon’s match type granularity is more mature
• Audience segments: Amazon offers 1,800+ pre-built in-market and lifestyle segments; Walmart Connect offers approximately 300 as of Q2 2026

“Luminate is genuinely useful for CPG clients who want to understand basket attachment — what else shoppers buy when they pick up your SKU. But for complex funnel modeling, AMC is still in a different category. We tell clients to treat Walmart Connect as a reach-extension and incremental testing budget, not a one-to-one replacement.” — Derek Hsu, Director of Programmatic Strategy, Publicis Commerce

What Ad Formats Are Available on Each Platform?

Amazon’s format library is the broadest in retail media. Sponsored Products, Sponsored Brands, Sponsored Display, and DSP programmatic buys are table stakes. Amazon has also expanded Sponsored TV as a self-serve format in 2025, and video inventory within Sponsored Brands is now available to sellers with Brand Registry — a meaningful upgrade for DTC brands trying to tell product stories within the SERP.

Walmart Connect’s format suite has grown materially in the past 18 months. Sponsored Products and Sponsored Brands are both available and perform well in high-intent search environments. Display advertising through the Walmart DSP has improved with The Trade Desk integration. However, Walmart’s in-store digital media network — spanning 170,000 digital screens across 4,700 U.S. locations — is a format Amazon simply cannot replicate. For brands with significant brick-and-mortar ambitions or omnichannel attribution needs, this is a genuine differentiator.

How Does Attribution Work — and Where Does Each Platform Fall Short?

Attribution is where both platforms have significant blind spots, and where most operators are still leaving insight on the table. Amazon’s attribution model defaults to last-click within its closed ecosystem — a setup that inflates Sponsored Products performance and makes it difficult to measure true incrementality. AMC’s halo analysis tools help, but they require SQL fluency or a managed service layer, and most sellers under $5M in annual Amazon revenue don’t have the internal resources to run them properly.

Walmart Connect’s attribution story is simpler but also more limited. The platform offers in-store and online purchase attribution for Walmart-sold items, which is genuinely useful for brands with a shelf presence. Off-site attribution via The Trade Desk integration is improving but still relies on probabilistic matching in many segments. Luminate’s basket-level data is a meaningful edge for CPG players who want to understand cannibalization and attach rates, but the tooling to act on that data at scale is still maturing.

Third-party measurement vendors like Northbeam, Triple Whale, and Rockerbox have expanded their Walmart Connect connectors in 2025-2026, which helps DTC operators who want to model Walmart alongside their Meta and Google spend in a unified dashboard. Amazon’s AMC remains less friendly to these tools by design.

Which Verticals and Seller Types Does Each Platform Favor?

The honest answer is that these platforms are not interchangeable, and the right allocation depends heavily on category.

• Electronics, software accessories, high-ASP hardgoods: Amazon wins decisively. Shopper intent is higher, the review ecosystem drives conversion, and DSP retargeting for considered purchases is more sophisticated.
• CPG, grocery, household consumables: Walmart Connect is increasingly competitive. Walmart’s grocery shopper frequency (2.4x weekly visits vs. Amazon’s 1.1x for grocery-primary shoppers, per Numerator Q1 2026) means more purchase opportunities per ad dollar.
• Apparel and beauty: Split. Amazon’s reach advantage matters, but Walmart’s improving fashion and beauty category (bolstered by the Eloquii and Scoop acquisitions) is generating real conversion data in the $25–$75 price point.
• Brands with physical retail ambitions: Walmart Connect’s in-store digital network is a unique asset. For brands trying to drive trial-to-shelf conversion or support a Walmart store rollout, no digital-only platform can replicate it.
• Emerging and challenger brands under $2M GMV: Amazon’s lower self-serve minimums and deeper organic search volume make it the better launch pad. Walmart’s DSP minimum spend requirements create friction for smaller operators.

“We run a blended Walmart and Amazon media strategy for three of our top CPG clients, and the incremental reach from Walmart Connect is real — we’re not just getting Amazon’s overflow. The shopper profiles are genuinely different. But you need to be selling on Walmart.com with enough velocity to get good attribution data back. If your Walmart catalog is thin, the ad platform won’t save you.” — Samantha Reyes, Head of Commerce Media, Leap Group

What Should Operators Actually Budget and Expect in H2 2026?

The most useful framework for operators is to treat Amazon Ads as a primary performance channel and Walmart Connect as a strategic reach extension — not a replacement, but not an afterthought either. Based on conversations with agency leaders and brand operators running eight-figure retail media budgets, a reasonable starting allocation for brands with genuine Walmart distribution looks like 70-80% Amazon, 15-20% Walmart Connect, with the remainder testing Google Shopping and emerging retail media networks like Target Roundel or Instacart Ads.

On the cost side, Walmart Connect’s lower CPCs are real but partially offset by lower conversion rates in non-grocery categories. Operators running Sponsored Products on both platforms in Q1 2026 reported average ROAS of 4.1x on Amazon vs. 3.2x on Walmart Connect for hardgoods — a meaningful gap. In consumables and grocery, the ROAS delta narrowed to roughly 3.8x vs. 3.4x, which most agency buyers consider within testing variance.

The tools landscape is also maturing. Pacvue and Skai both support cross-platform campaign management for Amazon and Walmart from a single interface, which reduces operational overhead for teams managing both platforms. Perpetua’s Walmart Connect integration remains partial as of June 2026, which is a limitation for Perpetua-native shops that want to extend their Amazon playbook to Walmart without rebuilding workflows.

The bottom line: Amazon Ads is not under serious competitive threat from Walmart Connect at the platform level. But for brands with real Walmart distribution and a CPG or consumables profile, ignoring Walmart Connect in 2026 is a tactical mistake. The CPC arbitrage is real, the first-party data is improving, and the in-store media network is a structural advantage no other retail media platform can match. Run the test, measure incrementally, and let the data drive allocation — not inertia.