My experience with the Nova is not that great. I don't personally use one. I exclusively shoot the 870, but my father won a new Super Nova in a raffle about 7-8 years ago at DU. Well the first 2 seasons of duck and turkey patterning the gun was GREAT. 3rd season, not so much. By turkey season the gun was shooting to the right and now he doesn't even spend the money patternin the turkey loads(while it still shoots good for duck hunting). I have seen it jam once in a while, but that was after intense mud hunting. I like the feature it has of clearing the mag without putting 1 in the chamber. Course dad is now exclusively using his classics double 101 12 gauge for all his wing shooting(well not turkey). Turkey he uses his 870(which is what i use for ducking hunting cause I dont like 28 inch barrels).
For wing shooting, I think the 3.5 shells are a littl overrated too. Its nice to get a little extra in there, but I havent noticed a difference in my shooting when I use the different loads. 3 inch is cheaper especially now with Mr. Obama in office and the ammo companies jacking the prices up.