Well for one thing, when they had the procedure done, I'm assuming they were infants. I'm sure that if you asked them they wouldn't remember having the procedure done, or having foreskin at all, so you really couldn't ask them which they like better and get an honest answer.
Using me for an example, I'm uncircumsized and I'm happy, but I really don't know what the other way around would be like. I've read several reports of young to middle aged getting it done for cosmetic reasons, then regretting it afterwards, because of less feeling in sexual situations, etc.