I'd say KuCoin got a decent credibility and I've been using it for quite some time - never had a serious problems so I'm all good, binance is okay too but its just as overhyped as uniswap so I shook it off. Exchanges are for trading only and solely for that reason so you just gotta choose where your preferences fits.
Kucoin is definitely one of the best ones out there. I am not the one to downplay Binance, because I use only binance and BSC right now, I do not use uniswap at all and I do not use Kucoin neither, but just because I do not use Kucoin doesn't mean that I do not know about them neither.
I have a friend who works there and I can tell you that they are awesome at safety, I do not remember any time they were ever hacked neither, like even Binance which has insane amount of money did get hacked few times, so it is a marvelous achievement not to be hacked in crypto world, those places are under attack every single second, not a second goes by without them being attacked. Hence I think even though I do not use them, I agree that Kucoin is one of the best out there ever, I do think Binance is awesome too but I wouldn't be able to say anything to someone who prefers Kucoin.