For me the best exchange platform is ED also known as etherdelta. This kind of platform is good and has a user-friendly functions. It can easily import ERC-20 wallets like MEW (MyEtherWallet) then you can have a transaction with an easy process. Still hoping for ed to have a good platform because a month ago there's an issue about hacking in ed but it works now. There are also other good exchange sites that has been created for us to exchange our coins but sometimes it depends on the company (if you consider yourself as a bounty hunter) because they choose an exclusive exchange site to trade their tokens/coin. My advice is, you must pick a legit exchange site on our recommendations because there are some scam and phishing sites that is spread all over the internet.