I also like KuCoin since the promotions are indeed very interesting. There are some interesting tokens traded on KuCoin, too that are not available on Binance.

Also, the amount of Airdrops distributed by KuCoin is higher. Binance seems to put many more into the own pockets.

In general, I have to say though, that I like the trading features of Binance more, for me, they feel more intuitive.