For now i love binance and bittrex but i love bittrex more because they have new platform and it's very comfortable for me to trade there
I can't comment about Binance, because I never had an account in that exchange. I have used Bittrex and liked their UI and setup, but I have used it only for low volume trades. The advantage with Bittrex is that they haven't asked me for any ID document till now.
You should use Binance exchange before it's too late. Bittrex does not currently have any problems with user ID verification. But Bittrex will freeze some accounts like Poloniex in a few next months