Boxing is a great sport, BJJ is a great martial art. Apples and Oranges.
If you really just want to learn to fight. you should do boxing. because in MOST fights you use your hands and it would be a really good advantage to be a boxer, and your big so your size mixed with your hands could be very dangerous. and bjj is mostly just ground and submissions
Learn BJ's in prison.
BOXING!!!
Bjj or boxing, I'm 6 1 230 pound bodybuilder I'm agile quick but very built good reflexes, when I have to defend myself usually grapple or ground and pound or get the guy in a headlock and feed him shots, when I defend myself so which martial art should I do between boxing and bjj? I never really box guys in a fight or very rarely but maybe it's something I could get good at idk