Trading with Bittrex is a bit slower, Binance is faster, and fee is lower. Also better about Binance Support
This is indeed true, among the reasons why Binance keeps the no. 1 spot now is because they are futuristic and they take care of their customers more than other exchanges. Everyone will definitely look for exchange with a big volume and to achieve a big volume means exchanges are doing well in all the aspects of the operation, so final answer, BINANCE.