I too have many that I like, not really a favorite, unless it is a Blizzard from DQ, or a Frostbite from Oberwiese... In that case, it is Chocolate Chip Cookie Dough....
Ice cream though, I like Cookie Dough, Natural Vanilla (or vanilla bean, varies depending on who makes it)... Mint Chocolate Chip (I prefer the white over the green), sherbert (with Vodka & matching fruit juice... A.K.A. Hill-Billy Martini)