Lately a new "Exchange 2.0" taking over. Bittrex & Polo suffer from many complains, locking accounts and many other issues.
Kucoin & Binance are quite different. they have their own token which give benefits.
Both are going very big in Asia and International.
Check out how Kucoin perform vs other exchanges:
https://www.kucoin.network/Your opinion?
Yes it is binance has gained a lot of popularity because of the smaller fees it is requiring compare to bittrex and poloniex plus binance doesnt have any security issues from the past unlike poloniex which was hacked from the past,KuCoin also is getting more massive day by day because most of the solid projects are being listed first in KuCoin before they have reached the major exchanges.