Short answer — it depends on what you buy:

• Best overall (single-brand online store): IKEA Malaysia — very generous and consistent 365‑day return policy for most products. (ikea.com)

• Best marketplace for easy, “change of mind” returns across lots of categories: Shopee (Malaysia) — Shopee Mall and eligible items are covered by Shopee’s 15‑day free returns / Shopee Guarantee initiative (expanded in 2024). Marketplace coverage is broad and centrally managed, so returns are usually straightforward. (help.shopee.com.my)

• Best for fashion/apparel: ZALORA — standard 30‑day returns for most categories (some categories 7 days), with clear online return steps; note ZALORA may apply a small return-processing fee to accounts flagged for very frequent returns. (support-my.zalora-ops.com)

• Mixed reliability / seller-dependent: Lazada — LazMall / Choice items have extended guarantees (15–30 days in some cases), but many listings follow seller-specific 7–14 day rules, so reliability varies by seller and fulfilment type. (pages.lazada.com.my)

Quick tips when choosing where to buy

• Check the product page for the specific “return” label (marketplaces show which orders are covered). (help.shopee.com.my)
• Watch exclusions (perishables, intimate items, opened beauty/skincare, electronics once used, etc.) — each retailer lists category exceptions. (support-my.zalora-ops.com)
• For high‑value or warranty items (phones, appliances), prefer official brand stores, large retailers (IKEA/Harvey Norman/Senheng) or marketplace “Mall/Official” stores for clearer warranty & returns. (harveynorman.com.my)

If you tell me what product category you’re buying (furniture, fashion, electronics, beauty), I can name the single most reliable online seller for that category and point to their return terms.