Forkdelta is like IDEX, TIDEX which includes MEW additions and private keys, vulnerable to hacking but without KYC.
Bancor, like Facebook social media but has a value in it that has an Exchange token, Yesterday in June 2018 I heard Bancor got hacked.
Binance, full power is on the Exchange and many tokens are circulating, lots of prizes when listing coins, the founder is always friendly in Tweeter.
For me the best exchange is binance, the best of all, I haven't used forkdelta or bancor but I believe that those are not good as is binance.
Binance has a good UI, a good UX and overall a great service, fast deposits and withdrawals and good with noticiations, it has a good volume for most of the coins and has greater limits than others.