to my opinion luigi & mario r almost = fighters except the fact that luigi is a couple heads taller than mario and has longer arms than mario arms but after that yoshi the gay flying dinosaur would fall out of the going 35mph(he's very fat) onto luigi and luigi would flatten like a pancake and die (poor luigi he suffered a cruel fate being wedged between Yoshi's butcrack.)
i think that they would both get destracted by bowser and would for get their differences and kick his shell. **cough** mario is awesome **cough cough**
Well, judging from the picture it looks like Mario would win because he has guns haha. Also, not judging it on the picture I would still have to go with Mario because like Mario a lot more then I do Luigi.