Short answer

• For the broadest, most consistently reliable returns across many product categories: Shopee and Amazon.sg rank highest right now. Shopee has committed to fast dispute resolution and wide free‑return options in Singapore; Amazon.sg (especially Amazon‑fulfilled / “sold by Amazon” items) offers consistent 30‑day windows and clear return/seller rules. (straitstimes.com)

Best choices by category / situation

• General retail (electronics, home, toys): Amazon.sg — predictable 30‑day windows and stronger protections when the item is Amazon‑fulfilled. (BrandRadar.org)
• Fast, convenient returns for many marketplace purchases: Shopee — CASE memorandum commitments to process refunds/returns quickly and free returns at POPStations. Good when you want free drop‑off options and faster resolutions. (straitstimes.com)
• Fashion / apparel / shoes: Zalora — category‑specific, clearly documented return/exchange windows (most items 30 days; some categories 7 days) and a returns workflow tuned for sizing/exchanges. (support-sg.Zalora-ops.com)

Notes & practical tips

• Always check the product page for “non‑returnable” flags and whether the seller is a marketplace third party or the platform (marketplace sellers often have different rules). (support-sg.Zalora-ops.com)
• Saves hassles: buy items marked “fulfilled by” the platform (e.g., Amazon‑fulfilled, Shopee Mall) where the platform’s policies/guarantees apply. (BrandRadar.org)
• Keep packaging, tags and proof of purchase; note some categories (beauty, underwear, certain electronics) have stricter hygiene/packaging requirements. (support-sg.Zalora-ops.com)

If you’d like, I can:

• Produce a short ranked list of 6–8 major Singapore stores (Lazada, Shopee, Amazon.sg, Zalora, Courts, Challenger, IKEA) comparing return window, free return availability and typical processing time with sources.