Ash is a normal human being and he's beeen surviving through a dozen Evil Dead comics because it's just pure luck. I think he's gonna die here probably.
Two things that can happen are these:
1) Ash revs up his chainsaw and cuts up an alien. The acid eats Ash'es chainsaw up and he only has his boomstick but before Ash can use it, a plasma bolt goes through his chest and he dies.
2) Ash succesfully kills the two and tells Ripley "Give me some sugar baby" lmao
does Ash have the necronomicon? if so then Ash wins 100%. unless its turns around and posses the aliens making some freaky hybrid. but even then he probly win. his coolness factor trumps almost anyone.
i can see something like Army of Darkness VS Aliens VS Predators with ash just flying under the radar for the most part and coming out in the end as the winner.