KuCoin and Binance are too great exchange site with a high volume everyday but I must prefer to use Binance since Im comfortable with the design and ui of this exchange site it has also an android application that easy to use the withdrawal transaction are good over all Im satisfy to this exchange site.
They are both good exchanges, we don't need to compare them both. These exchange have the best customer support and all coins listed their are legit. Aside from that, if we sell our coins in these exchanges, assume that we will got a lot since pumping of coin is easy. Transactions are also done easily, we can deposit or withdraw with just couple of minutes. Therefore, binance and kucoin are good exchanges.