Cooking up a frozen pizza is often a bit of a crapshoot. Sometimes you want the convenience of the microwave, but you don't want to sacrifice the taste you get when you cook it in the oven. As it turns out, Consumer Reports suggests that if a frozen pizza has a "recommended method", that's the best way to cook it, even if that means the microwave.
It sounds like common sense that the recommended cooking method would be the best, but the surprise here is that the method isn't always the oven:
DiGiorno, for example, lists the microwave as the "recommended cooking method" on its Traditional Crust cheese and pepperoni pizzas, and that's definitely the best way to go. The pizzas cooked in the conventional oven were drier on the edges and a bit doughy inside.
Basically, if a manufacturer lists "recommended" or "for best results" on the directions on the box, that's usually the best way to cook it, even if it defies common sense. If it doesn't specify, the oven is the best bet.