I am trading and holding on several crypto exchanges.
Bittrex, HitBtc, Exmo and now I have just registered on Binance.
Bittrex. I love it, i love the variety of coins and it is comfortable to me to use this exchanges. There was a problem with enhanced verification, i did not pass it automatically and it took 1 month to their support to check it manually and to answer to my ticket. But now i am verified.
HitBtc. Also a lot of choice of coins. I like it too, but do not know why but I do not believe them -_- And they have verification application by email... But still using it.
Exmo. It was my first exchange. But I use it rarely.
Binance. I've just registered so can not say anything. I hear a lot of good words about it on forum here and from my friends.