OK- I can't give you first hand experience on either; however, I think Tutto just changed things up and the reviews I've seen post renovation and updates seem much better than they were prior to this. I know Via Napoli gets very good reviews, but I haven't seen any head to head reviews on the two since the Tutto changes.
I must say that based on the recent Tutto reviews I've seen from bloggers- I decided to book it. Although I may have a change of heart if they ever open up ADRs for Garden Grill for our Epcot day.