The best exchange right now is of course still held by Binance, Binance always provides the best service for users,
yesterday there was a TWT airdrop that was distributed for free, and also a few more airdrops,
this is the first time I get an airdrop from an exchange, because since I trade on other exchanges I never getting an airdrop, I chose Binance!
i thought the airdrop was distributed not yesterday but few days ago. but anyway, right now, you will feel safe to use binance because of their safu. so the OP, who created this thread almost 3 years ago, should have already his list of trusted exchanges. and also, i didnt know that binance for a time was not accepting new registrants based on OP's post.
aside from binance, there are also other credible exchanges. as long as you are not storing your coins to these exchanges, you are pretty much safe.