None. Honestly. BJJ, aside from some of the self-defense stuff that some of the Gracie schools teach, has nothing to do with standing strikes.
In MMA, we've seen BJJ and submission guys with striking backgrounds that include karate, Taekwondo, boxing, and Muay Thai. None really seem better or worse than the others, in proportion to their skill level. Go with what you feel comfortable with.
Western Boxing
Muay Thai but I really like Wing Chun
for a more complete fighter, i'd say something like boxing/muay thai/kickboxing
Muay thai.
Which ever one you enjoy
In my opinion, its Jeet Kune Do, but I could be wrong.
