Like most super tasty things, they're super simple too. And as with anything simple, there's no hiding when you use poor quality ingredients. Or as George, our resident affogato smasher says, "if you put great in you'll get great out. Put sh*t in, you'll get sh*t out". And he's right, so use the best you can afford.
Pretty much any ice cream works well for affogato, but if you want to honour the age-old tradition and go for the O.G, it's got to be vanilla. That'd be boring though, so we really rate Halo Top's Salted Caramel, especially as it's totally dairy-free too.