The Margherita is a family fav, and is my nieces' and nephew's favorite pizza of all time (they had never had it before going to Via Napoli), and is the one thing they beg to have at Disney every time. If it matters, the basil is really easy to avoid if they don't like it.
ETA: we get a Mezzo Metro for our fam; from anywhere from 5 to 9 people. Supplement with anything else we want such as appetizers or salad.