I take Vader, but I insist this isn't the squash match most would lead you to believe. If you want to talk about power, Muraco, in my opinion, is easily stronger then Vader. Don Muraco was a fucking beast and a half. A by product of rampant steroid abuse, surely, but you have to give credit where credit is due. Plus, Muraco had a damn fine run as a mid card heel with Mr. Fuji at his side in the early-mid 80's. The guy was as solid as they come.
However, Vader wins this match. Sure, Muraco was an ECW champion, but the E stood for Eastern. Vader is a big nasty son of a bitch. Is his power game pretty much equaled out, yes, but his brawlign game isn't. Muraco would get the advantage, and try some power move, and end up injuring himself, something Vader would exploit, adn then use to win the match. Vader wins, but certainly nto a squash.