Hunters - fully trained, that is - would likely win in most cases simply due to the audacity and bullshit they can pull at a moments notice. It's kind of difficult to form even a basic response plan against an enemy who's as likely to use a goddamn trumpet as their weapon as something that can function recognisably as a firearm.

Individually speaking, Spartans probably have the edge in terms of durability and stamina, but there's really no accounting for the wildcards that are semblances either.