Binance is the best Exchange-2018, try it and you will like it!
+1 binance for me also.
security is good, easy trading, no extra effort needed, and doesnt eat my coins.
as of now, binance is leading because of its active promotions unlike bittrex that is so lame.
In recent times binance has captured a very good market and seems to be rising its number of users daily. They have being pretty busy as in between they had shut their site for some 36 - 48 hours in order to do maintenance and improve its security features. Overall a good site for investors and traders as well.