In terms of trading, Binance might still be the choice among the 3. In terms of safety, I'd rather choose KuCoin over Binance. If I'm not mistaken, KuCoin has never been hacked. Binance had a leak and a hack. Although FTX is the emerging option. In terms of withdrawals, FTX might generally be the best choice as it has the cheapest.
Just be careful not to use it as long term storage.
Why is that?
I'm a little bit surprised this was even asked, but it's a good question.
Well, it is because it is not safe.