Currently I'm making use of binance like you, cause it undoubtedly the best crypto exchange right now, I make use of binance cause there's enough liquidity, also many pairs and not just that, the user interface is pretty cool seems kinda easy to navigate around for a newbie, have never made use of Okex, Huobi and Gate.io, I have used kucoin its also a nice exchange, but binance is still the exchange I prefer trading on cause it has more liquidity.
I have the same sentiments here. I am using both binance and kucoin. But I still prefer to use Binance over kucoin. Maybe, because Binance has insurance in place, which I feel safe and secure for my funds. Also, the trading is not so complicated with binance, unlike kucoin, you need to transfer your funds to your trading account and then transfer it again to your main acct if you want to withdraw. In binance, it is pretty straightforward. But anyway, so far, I can only vouch for these 2 because never used those other 3 exchanges.