Like all great enemies, Thomas Alva Edison and Nikola Tesla started out as allies before the former pushed the latter into an active volcano (of unpaid work and idea theft). In the 1880s, the two were involved in the War of the Currents, which disappointingly involved little to no actual warring -- it was more about each one trying to convince people to use their respective power distribution system. Who won? Well, if you go by whose system we all use now, then Tesla, but if you mean who didn't die poor and became one of the most respected inventors in the entire world, not just Internet message boards, then definitely Edison.
There's no clear winner, is my point; nerds have been debating the old Tesla vs. Edison problem for over a century. This ends today.
I'm giving Tesla a high-tech arm cannon, because I'm pretty sure that if he'd ever constructed the mysterious "death beam" he spent his final years devising, it would have looked exactly like this. I'm also giving him guided missiles, or as he called what was (essentially) the same technology when he patented it in 1898: "teleautomatons."
He was almost as awesome at naming things as he was at inventing them.
As for Edison, he'll wield a beam sword (apparently Nintendo can't say lightsaber), because it seems like the obvious, natural progression for the guy's most famous "invention," the light bulb. Continuing with the light theme, he'll also be able to throw shurikens made of pure energy -- the perfect weapon for swiftly electrocuting dozens of stray animals, as Edison once did as part of his anti-Tesla smear campaign.
Perhaps not with this exact method, though I'm not discounting it.