Personally, I consider Grizzlor to be stronger and more skilled with various weapons - at least this MotUC version, since he has all these weapons. If they were crude weapons I'd say he was just swinging them around, but they're pretty nice, and well thought out. A hatchet, a longsword, and an axe. Covers all your needs. This guy is a skilled hunter and fighter!
Beast Man is SAVAGE, and probably a good hand-to-hand fighter in terms of wildness. In a straight fight, I think Grizzlor would win. BUT...Beast Man has control over just about any beast. It totally depends on what is around! And...are we certain Beast Man couldn't attune himself to Grizzlor's baser instincts? Of course, I have no way of proving that, so I'll just say that it comes down to however many animals Beast Man has to control, and what KIND of animals. Otherwise, he would be backed into a corner by Grizzlor's centuries of skill (if we're going with the fact that Hordak has stretched his life unnaturally).