I'll be very candid. I've played around with both cut and intact guys, and I've been in relationships with both cut and intact guys. For me, the guy comes first -- his brain, his personality, his sense of self-respect.
But I have a strong preference sexually for other intact guys. The reason is ridiculously simple: the penis works right. The shaft skin is supposed to be so pliable and generous that if you put your fingers at the very tip of the covered head, you can roll the skin down to meet his pubic hair. It's the only part of the human body where this is possible. The foreskin is absolutely packed with blood vessels, specialized nerve endings and specialized muscle tissue. It works in gorgeous harmony with the shaft and glans. Learning to "turn on" the foreskin (theirs and mine) wasn't instinctive, but once I got the hang of it, it became a wild ride.
Many circumcised guys have shaft skin that doesn't move at all when hard, or very little. There's enormous -- even baffling -- variation in what stimulation they prefer/need, far more I've found than with intact guys. Some cut guys want you to really include the head in hand and blow jobs, others don't want you to touch it. Some require stimulation of the foreskin remnant or frenulum remnant, others want action nearer the circumcision scar or their piss hole. Some want you to grip, and some want you to use lube and glide. In the end, it just adds up to be a lot of extra work, IMO the guys compensating for the normal part they're missing. (An important caveat… in my experience this is far more true of guys cut at birth. Late cuts have stimulation profiles much closer to intact guys for various obvious reasons.)
I like intact guys because they have the anatomy that's integral to the gender I'm attracted to. A foreskin is part of being born male. I'm less attracted to women in part because their anatomy doesn't interest me, and to circumcised guys because their penises work differently. I've been with hundreds of circumcised guys, and over time it became a recurring disappointment (with some wonderful exceptions). I've had years to hone technique and I think I'm pretty adept with both circumcised and intact penises. But the responsiveness I can elicit from the intact guys -- especially when I show them something new -- just makes the experience much more satisfying for me.