Pizza has so much more variety.
Different brands, some of the microwave and oven brands are actually OK.
I have NEVER had a good microwaved burger.
Also, lots of different crusts.
And MANY more toppings than can be found on a burger.
My favorite is GodFathers. But they are rare.
2nd fav is Papa Johns. Also rare in some places.
I hate Dominos and Pizza Hut and they seem to be the most common.
EDIT: Holy crap! I forgot about Rocky Roccocos!
They make the BEST pizza in America. Unfortunately they only have a handful of resturaunts in the midwest.