In past, the popular market is Bittrex and Poloniex, but there are now Binance and the Global Huobi who have managed to get the No. 1 in the hearts of traders. So now it is better to use Binance market to trading. I am also use it until now
I prefer to use binance exchange with good quality exchange. Yes before bittrex was the popular exchange but since binance was also good in terms of volume and its features I prefer to use this exchange.