I think I would go with one of these for this guy:
9, 19 (Health/Speed)
6, 16 (Health)
He's a "tank", as in his damage output is not incredible, but he's very long/hard to take down due to different heals and damage reduction. Crouch, like mentioned earlier, will benefit a bunch from higher speed (basically counts as lasting one more round if you go first). And being a tank style pet, more health is a big plus as well.
It was mentioned before that Power would increase his heals, but it's only true for Leech Seed. This guy also heals from his humanoid passive, which is increased by higher health. So I think Health is definitely a better option than Power for this guy, increases one of his heal AND his total HP, making it that much longer/harder to take him down.