I have done it both ways. Doing it wet I think it feels much better, but do it in the bathroom, so I don't make a big mess. It will depend on the mood I am in or where I am when I get horny and get a hard on.

OOOOH HORNEY BOY

I love going dry and feeling my foreskin stick to the head a little as it moves over it. I usually clean up the precum so it doesn't dry and get too sticky. If I go long enough I will usually put some lube on the head to prevent chaffing. Though sometimes I lube up and rub the head for a change of pace.

They are different sensations. I like both. My penis feels different, different times, I'm not sure I know why. If i'm in it for a long jack I usually go with various lotions--whatever my wife has discarded as not her favorite.