Those 2 are the same thing... do you mean damage and hitpoints?
I think damage boost for commandos is pretty useless as they will 1-hit most buildings either way at a high level (except for Fort, Silo and few other buildings, which will need more than 1 hit even with museum boost). Boosting HP is the way to go.
2 slots of Commando HP and 2/3 slots of Fighter HP/dmg is the most valuable for these attacks