Thing as of End Game, Asgard already wiped out. There may be only a few warriors left. Wakanda is still around and still have lots of warriors.

So if army size definitely Wakanda will win. If both was at peak almost i would side with Asgardians. Asgardians are almost always bigger & stronger due to genetics. These people travel around worlds to fight & conquer in the name of peace. Wakanda is high tech turtle. Infinity war already addresses that.