My nipples were on the smaller side, so I originally wanted to keep them uncut. However, my surgeon explained that the nipple complex was much more likely to survive if cut in half due to the fact the severed nerves wouldn't have to work harder to keep alive a thicker part (while it was detached). Something like that anyway. He also explained that they would most likely look more natural if re-sized because male nipples don't undergo the puberty growth process. Of course, I was opting for grafts anyway, so sensation wasn't a concern. If my aim was to preserve sensation via pedicle, that may or may not have trumped aesthetic concerns.
And to be honest, some post-op pics I've seen where they weren't re-sized do look different (mostly DI though. Haven't seen too many peri pics, so can't comment there) Sure guys have a variety of nipples, but if you're aiming to look just like the average Joe when shirtless you may just want to go with the standard cut up.
