yea think the swords do a bit more. You'd have to look it up.Is the dmg that much different? I like one/two hitting with the big hammer.
The one thing the hammers do better is with the perks: ignore armor rating. Where as with the great swords, you get extra bleeding damage.
Plus i find the unique 2 handed swords to be much more interesting than the others. You find a pretty sweet ass one that shoots freaking laser beams by doing a quest in the DLC area (if you have dragonborn addon). Although a crafted daedric greatsword will be better.