The Strength gain to your Min/Max Damage is minimal. It takes about a minimum of 800 (or 900) to notice a difference. Damage is mostly calculated by the weapon you use and the Min/Max enchant on it.
At least with Stamina, you'll be increasing your survival rate against mobs (if that happens). Higher Luck boosts your critical rate and negates the chance that a monster will deal critical damage to you.