Mostly people where choose binance because there is a huge volume in binance and they said a friendly user exchanger. I do like bittrex to but if you are a newbie you will found it a little deficult in bittrex but still he is a good exchanger.
Choosing of any of the trading exchange is the personal choice of the ones who are into this thing and that there are people who like binance while others are in favour of using bittrex. I think of bittrex to be the best one amongst all and that the features which this trading exchange has, there is no other exchange which can compete with bittrex on that, not even binance.