Should i join an mma gym or a boxing gym?

Which one is better for me? I'm 5, 11 220lbs (not fat very muscular and thick) i like mma because its a little bit of everything but i feel like its not practical and a bit over rated but i feel like boxing isn't very intimidating anymore, i'm not one for all the fancy grappiling and take downs i just want something practical an i really wanna get strong quick powerful punches like devastating punches, any help?

P.s I tried ninpo ninjitsu and i wasn't very into it (sorry about typos i'm on an iphone and i'm 17)

Added (1). Btw i want something more usefull in a street fight i like to brawl

Either one man I'm trying to do the same, both seem like they'd be fun and challenging (in a good way).

I'd say mma if you want to have fun, boxing is the best martial art for punching power, boxing gets you richer, mma is more useful in street fights I think, but boxing is cheaper, for someone like you maybe like you described yourself, I'd go with boxing