Short answer — it depends on what you want, but the best overall site for men’s fashion in Malaysia is Zalora. If you want alternatives by need, here are the top options:

• Zalora — Best overall: biggest local selection of men’s brands (high‑street to designer), size of catalogue and fashion focus make it the go‑to. (zalora.com.my)
• Shopee — Best for bargains and many independent sellers/SME boutiques (huge variety, frequent promos). (shopee.com.my)
• Lazada — Big marketplace with curated fashion channels (LazMall / LazadaStyle) and local designer drops. Good for sales events. (lazada.com.my)
• UNIQLO Malaysia — Best for high‑quality basics and functional everyday pieces (AIRism/Heattech). Use their Malaysia online store/app for availability. (apps.apple.com)
• Brand or premium/formal specialists (example: Sacoor Brothers, Calvin Klein official local stores) — for suits and smarter menswear buy direct from brand stores. (my.sacoorbrothers.com)

Quick tips: choose Zalora if you want the easiest one‑stop shopping and lots of brands; use Shopee/Lazada when hunting for discounts or hard‑to‑find local sellers; go to brand sites (Uniqlo, Sacoor, Calvin Klein) for fit/quality on specific labels. If you tell me the style or budget you’re after (casual, workwear, streetwear, formal), I can shortlist a few specific stores or brands.