Comparison

Asda vs Sainsbury's

Asda and Sainsbury's both land on Depends.

Asda

Depends

Confidence: Medium

Buy if you want cheap weekly groceries and will check your receipts.

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Sainsbury's

sainsburys.co.uk

Depends

Confidence: Medium

A sound choice for UK weekly groceries if a store is near you and you use Nectar Prices.

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Asda versus Sainsbury's
Compare	Asda	Sainsbury's
Verdict	Depends	Depends
Best for	Budget weekly grocery shops	UK weekly grocery shops
Who it's not for	Shoppers wanting premium fresh produce	Shoppers expecting the cheapest basket . Tesco beat its price-match scheme
Privacy	Consumer site with a patched 2016 payment flaw and 2024 breach warnings; no critical CVEs for Asda itself (ASDA-Soft CVEs are unrelated Delta Electronics software).^⁸	No public vulnerabilities in.uk itself; 2025 incidents touched the loyalty scheme and a shared supplier.
Support quality	Charging errors and service complaints dominate reviews	3.6/5 Trustpilot; complaint threads dominate reviews
Public sentiment	Shoppers praise low prices but repeatedly flag fresh produce quality, charging errors, and poor service.^¹	Mixed at 3.6/5 on Trustpilot, with online substitutions, price creep, and billing discrepancies dominating negative reviews.¹²
Biggest gotcha	Customers report being charged incorrectly in-store and online; check receipts carefully.¹¹	Substitutions arrive wrong or overpriced; you must manually check the substitution price promise.¹⁵

Pick Asda when

Budget weekly grocery shops
Big-basket online deliveries
One-stop family shopping incl. George clothing

When Asda is not a fit

Shoppers wanting premium fresh produce
Anyone needing reliable customer service
People burned by till/online charging errors
Buyers wanting organic or specialist ranges

Pick Sainsbury's when

UK weekly grocery shops
Nectar members chasing member prices
Click & collect and local top-ups
Just Eat rapid delivery users

When Sainsbury's is not a fit

Shoppers expecting the cheapest basket . Tesco beat its price-match scheme
Online orders needing exact items . substitutions frustrate
Anyone outside Sainsbury's delivery zones
Bill-averse shoppers . checkout discrepancies reported

Sources

Trustpilot reviews of Asda groceriestrustpilot.com
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2,681 Reviews.io reviews of asda.comreviews.io
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Honest opinions on Asda . Redditreddit.com
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Why don't more people shop at Asda? . Redditreddit.com
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Asda company factscorporate.asda.com
official
Asda offers, Rollback and Price Matchasda.com
official
Asda Scan & Go on Azure . Microsoft case studymicrosoft.com
official
Asda bug exposed payment details . BBCbbc.com
security
Asda data breach warning . The Grocerthegrocer.co.uk
security
Asda fined £640,000 for food safety breachespinsentmasons.com
news
Asda customers fume over charging 'mess' . Metrometro.co.uk
news
Trustpilot reviews of sainsburys.co.uktrustpilot.com
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Has Sainsbury's got noticeably more expensive? . Redditreddit.com
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Beware of online grocery shopping at Sainsburys . Mumsnetmumsnet.com
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Be careful . Sainsbury's substitution policy . MoneySavingExpertforums.moneysavingexpert.com
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Check your online delivery bill . MoneySavingExpertforums.moneysavingexpert.com
review