It depends on what fiat currency you are withdrawing. They have same feature in terms of withdrawal capacity. The only edge of FTX is there leverage trading since its an advance version and that's the FTX arsenal feature. But Kucoin list gem coin more often since FTX is very careful on selecting the coin that they will list compared to Kucoin.

I suggest that you should indicate too your preferred feature of an exchange so that we can recommend a proper exchange that suitable for your taste. We can put all the features here but it will be hard for you to assess if you are still new.