Coinmarketcap have both list of reliable exchanges and unrelaibale exchanges, so I would not still advise to rely on coinmarketcap to choose trading platforms, CMS is more effective in deciding which coin to invest in by choosing from the top listed coins, but I don’t think there are top listed exchanges on CMC.

In order to choose a perfect trading platform, one still need to make enough research on anyone we are advised to use and it is easier to get review on one on this site and on the internet. For example, Binance platform is what many of us know, while Yobit is a very bad platform, but CMC still have it listed for some coins.