See "Pics of your Rifle and Gear". I've got a Super91 in .410 that was dressed up by Bob Bowers.. very nice rifle. And a 98 Elite which has a very similar action (straight tapered barrel instead of contoured). You couldn't pry the 98 away from me but I think neither rifle really has anything on the Ultra Mags. If anything, the Ultra Mags are easier to clean.

Edit: they do have the advantage of being easier to scope so far as base placement and thus ring/scope positioning. The S91-II might be a bit lighter as well. (Mine is not a II, it has the barrel underrib).