Awesome question, but would this fight take place before or after their experiences in the movies?
If before: Alex – Dude comes from a trailer park; he can fight dirty and is possibly half-cut at any time of the day.
If after: Billy – The stark fist of reality shows him that all that is cute and lovely actually contains something dark and evil. Taking on an army of gremlins toughened the crap out of that kid. Put it all together, its a win. To top it all off, Phoebe Cates is “more than just a friend” and that’s worth fighting for.