976 is a bit thick compared to the ultra thins, but what seems too big for me is the length and width. The length spans my entire wrist if you include the lugs. However I do love the dial and decoration on my 976, so I'll keep it. If it was a plain 976, I'd prefer the grande taille or the new duo.
I like lightweight watches so yes, I'd prefer ultra thin for that. But that's just me. I know that many like the weight of a watch. As it is the thickness doesn't bother me.
As far as duo faces they're supercool but l usually prefer one side.