I see, Binance has an advantage above Kucoin, because at the moment we know that binance with BNB tokens, shows a very increased circulation, in fact some people start betting that bnb will dominate the coin at some time.
KuCoin will show its positive sides in the future, while Binance has already proved that for now, this is the coolest exchange, and the token is one of the potential best gainers. I will not hesitate between two of them choosing BNB. However, if we are talking about exchanges, not altcoins, I am sure that it is needed to have accounts on both of them (I use more trading platforms).
Rating is also volatile, and it is good to compare it always.