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?
I don't have anything against both of the exchanges but Kucoin has been in a recent bad lighting?
I can't remember if its verify, but the thing is it is documented. They send all the details on their medium post.
Anyways, I love binance. it's quick and a very good user interface.