I use a bunch of different exchange depending on what coins I need. Ones like Bittrex, Poloniex, Binance and HitBTC get a lot of my action. I also user EtherDelta to get new hard-to-find ERC20 tokens. EtherDelta is a decentralized P2P exchange and allows users to trade directly. It’s used to trade Ether and any ERC20 tokens. So hopefully, these will give you a good start.