Don't waste your time shooting 3 1/2. The extra expense isn't worth the ROI (Return on Investment). 28-inch versus 26 is a matter of personal preference. Finally, I've hunted with nearly every brand of shotgun you can name in my 68 years. Currently I am shooting a Franchi Affinity 3 (I won it at a Ducks Unlimited banquet). For however long I live, I will never hunt with another shotgun. Best shooting, most reliable shotgun I've ever carried into the field. But, I know that's a "Ford vs Chevy" kind of debate.
I hope you're as happy with whatever you buy as I am with my Franchi.