I don't do either to my horses, since they have trouble growing long manes/tail in the first place (except for Pecho). But if I had a horse that was bred for it like fresians and what not, I have to say, I probably wouldn't take off all the forlock, just enough to clean it up and make it look nice and sharp instead of poofy. Thats just me though, I'm not sure how they are required for shows, they probably would have to come completely off I'd assume.