This is one reason I like Fjords, the mane can be so fun! I seen dragons and castles, just so much variety!
Otherwise, if I was showing, it would depend on breed and the horse in particular. For example, a Canadian I would leave natural, maybe thin a bit with shears but no shortening. A QH I would likely pull (or just shorten with a solo comb). But like I said, it depends on the horse too, his personality might make me do something different.