Short answer — there isn't one single “best” for every purchase. But by reliability (clear, generous windows + platform-backed refunds) these stand out:

• IKEA — Best overall for home/furniture: a very clear, generous 365‑day return policy for unopened items and documented exceptions. Reliable in practice because returns are handled through stores/returns centres. (ikea.com)

• ZALORA — Best for fashion/apparel: standard return windows up to 30 days for most categories, clear steps and free return drop‑off options for eligible items (note they also monitor very high-return accounts). Good for clothes/shoes where free returns matter. (support-sg.zalora-ops.com)

• Shopee / Lazada — Best for general marketplace shopping when you need platform protection: both platforms have formal buyer‑protection and dispute processes (Shopee has publicly committed to faster refund/return resolution and a 15‑day free‑returns initiative for many items; Lazada has buyer‑protection, extended LazMall return windows and an internal dispute timeline). These are reliable when you buy from LazMall/Shopee Mall or sellers with clear return logos — but seller listings can vary, so check the product’s return badge before buying. (malaymail.com)

• Courts / Challenger (electronics) — Best for electronics from local retailers: Courts offers a 30‑day “hassle‑free” returns approach for many items, while Challenger’s online returns are stricter (often 7 days) but are clear about eligibility and in‑store/collection procedures. These bricks‑and‑clicks retailers are often more consistent than third‑party marketplace sellers for warranty and returns. (courts.com.my)

What I recommend

• If you want one store with the most consistently reliable, consumer‑friendly return policy overall: IKEA. For fashion: ZALORA or big-brand direct sites (e.g., Charles & Keith) that publish 30‑day returns. For a wide range of goods with platform protections: prefer LazMall / Shopee Mall / verified sellers on Lazada or Shopee and check the item’s return badge before purchase. (ikea.com)

If you tell me the product category (furniture, electronics, clothes, groceries, etc.), I can give a one‑line pick tailored to that category and link the exact return‑policy page for the store.