I prefer binance since im not using kucoin for a long time and i think they required to do KYC im not really sure but binance is still the best in terms of volume
Yep, and their team is really working hard for on their technology. I'm using binance for about a year now and overall I don't experience any problem with this exchange and its continue to be a leading crypto exchange in term of volume being trade. This two exchange is quiet similar so for me choose the exchange you think is more convenient for you.