Took Judo for several years. Went to an Ultimate Fighting tournament one time and saw that EVERY SINGLE TIME one of the contestants knew JiuJitsu, they won. JiuJitsu kicked everybody's ass all night long. Size difference did not matter. This convinced me that when you are in a REAL fight, you better know how to grapple and do close combat. Unless you knock someone out with your first punch, chances are you'll end up on the floor or grappling. For this reason I am starting JiuJitsu in 2 months.