I'm not a big ice cream fan, but the best is homemade. My favorite of all time is a homemade simple Espresso ice cream. Sublime. Recently watched a Tasting History with Max Miller (great YouTube channel) where he made a Victorian cucumber ice cream. That became our Shavuos flavor.
Of commercial ice cream, Häagen Dazs wins for me. Favorite flavor is Strawberry Cheesecake. CY is just disappointing.