I only have the Mini, but the Small Forest Axe is the next on my list. Think about how he might want to carry it. If it needs to go inside a pack, I think I'd go with the Wildlife. If it can be strapped to a pack, I'd go with a Small Forest.
Here's something worth noting about the Hunter: "The Hunters axe is made up special for hunters. The poll is forged thinner than normal and gently rounded and burnished to a Flay Poll to be used when skinning an animal. You pull the hide with one hand and at the same time you hit with the Flay Poll of the axe between the hide and the flesh; and stroke by stroke the hide comes off. "
Unless your boyfriend is going to be doing a lot of skinning, I think the Small Forest would be a better axe. As already noted, the square butt has greater utility outside of skinning.