Short answer: for clothes in Singapore, shop on Zalora if you want a fashion-focused, brand-backed experience with easier returns and better size/fit support; choose Lazada if you prioritise lower prices, lots of variety and big flash-sale deals — but stick to LazMall or highly rated sellers to avoid fakes or seller issues. (zalora.sg)

Why (quick comparison)

• Zalora — fashion-first marketplace, carries thousands of brands and features fashion tools (size charts, curated looks) and options like ZNow (next‑day) and up to ~30‑day returns on many items. Good for branded apparel, better product information and returns. (zalora.sg)
• Lazada — a broad general marketplace with very wide selection and frequent big sales/flash deals; LazMall hosts official brand stores (authenticity promise + extended returns), but non‑Mall marketplace sellers vary in quality so you need to check seller ratings and reviews. Great if you want bargains or lots of choices, less ideal if you want guaranteed fit/brand support. (therakyatpost.com)

Practical shopping tips (apply to both)

• For branded/expensive items, buy from the brand’s official store on the platform (Zalora brand pages or Lazada’s LazMall). (therakyatpost.com)
• Always check the product’s return window on the product page (Zalora often shows 30 days for most categories; LazMall items typically have a longer return window). Keep delivery tracking and don’t "confirm receipt" until you’ve inspected the item. (support-sg.zalora-ops.com)
• Read recent reviews and seller ratings, filter for “Ships from Singapore” or local sellers if you want faster delivery and local warranty. Use platform vouchers and scheduled sale events to get the best prices. (blog.moneysmart.sg)

One-line guidance to pick quickly

• Want reliable sizing, brand selection and easier returns? Use Zalora.
• Want maximum discounts and variety and don’t mind vetting sellers? Use Lazada (prefer LazMall/high-rated sellers).

If you tell me what matters most to you (price, brands, returns, speed), I can give a single-platform pick and a short checklist for the best deals.