Forgive my fanboyism. Savage is considerably taller, larger, and superior in muscularity. His horns are longer, his head is not as round, his nose is shaped considerably differently. His cheekbones extend more. Even before being mutated, he was taller than Anakin or Mace. Maul is shorter, smaller, less muscular. His horns are short, his head is rounder, and his nose is more narrow. His cheeks are kind of sunken--if that's the right word. And he's almost as short as Ahsoka. Savage's tattoos sort of remind me of a Mexican bullfighter--not sure why. Moreso, a gladiator of some sort. More dominating. Maul's tattoos seem a bit more satanic, and they're more intimidating I assume.