I'm not sure if I have a preference when it comes to cut or uncut.. And if I did, it's near the bottom of my "list of things I look for in a packer".

From most important to least important, that list probably looks like:
1)
MaterialI want a packer that doesn't tear easily and will last me awhile. I want it to be relatively easy to wash. And I don't want it to be "sticky"
2)
FirmnessI don't want something that's so hard that it looks like I have an erection all the time! But I also don't want a packer that is really "smushy". I want a happy middle.
3)
SizeMost packers would be awkwardly large on me (and most guys, I'm sure). I need something that looks realistic -- I don't want people to look at me and be able to tell I'm stuffing my pants.
4)
Balls!I'd settle for a "flat back" if I had to, but I would much prefer something with 3D balls. And I would
love if they moved like a "real" set of balls.

5)
Paint job and detailLike with the balls, I could settle for a mono-colored packer, but I really want something "realistic".
6)
PriceI don't
want to have to dish out a bunch of money for a packer, but I'd rather have a good, expensive packer than a cheap, crappy packer.
7)
Cut vs. UncutLike I said, near the bottom of my list.

I may have a slight preference for cut (which is good because I know there are very few that aren't), but that's only because I feel it'd be easier to keep clean.
8 )
STPSure, it'd be nice to be able to pee standing up. But it's never been a big deal for me.
9)
Pack 'n' PlayI'd like to be able to just "whip it out" as much as the next guy, but I'm not too concerned about this. It'd be a little awkward, but a dildo would do the job just fine.