It is best to choose a more formal flagship store when buying a four-piece suit. In this case, both JD.COM and Tmall can do it, because the flagship store can guarantee that it is genuine and the quality is up to standard, but it is best to choose JD.COM, because the after-sales service in JD.COM is much better than Tmall. If you need to return the goods, the service in JD.COM is better than that in Tmall. Tmall Supermarket and JD.COM. COM's self-operated stores are platform direct stores, which can guarantee product quality, but Tmall's products are more comprehensive.