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http://static.tvtropes.org/pmwiki/pub/images/Wrex_7198.jpg
Urdnot Wrex from mass effect
VS
Predator from the movie predator 2

Wrex gets a shotgun and pistol, predator gets all the gear he had in the movie.
Fight 1 ~ no stealth for pred.
Fight 2 ~ stealth on for pred.
Fight takes place on Krogan home world Tuchanka

Wrex has biotics. I believe he wins.

Anyone is the Mass Effect universe that the only biotics is a poor choice because the only things people say is biotics >>> all. Which makes me wonder in the games why this isn't the case but whatever.

Regardless Wrex wins.

They aren't greater than all but they are more than I think the Predator can handle combined with Wrex's combat experience.

Wrex in a stomp. Even without his biotics he's been fighting for a few hundred years, and is incredibly strong and durable.