I like Bittrex and Poloniex because I started off there, but lately they have not been the best in the world. Hard to argue with Binance not being #1 and I also like Kucoin quite a bit. Cryptopia wasn't bad last year, but they really have not had their stuff together this year.
In the early times, I like both but time has changed, I like Binance now and it's one of the exchanges where you can trade even if your account
is not verified and it owns the best volume in terms of daily volume. As a trader, we like to trade in big exchange as they are more secured.