Bittrex offers more coins and more trading pairs than Binance. When I couldnt find something on Binance I can usually find it on Bittrex. I started out just on Bittrex, then switched over to Binance because of the lower fees and the mobile app. The only thing I have bought on Bittrex recently was Steem, but now that it is listed on Binance, I probably won’t be using Bittrex at all. However if Bittrex gets the fiat on ramp like they are talking about I might go back to using them for that if they are cheaper than coinbase. I prefer to do all my business in one place; at the moment Bittrex is second chair to Binance for me.