When you come by it is order by the slice. They have several pizzas out, you select what looks good, and then they throw it in the oven for a couple minutes to quickly reheat it (the pizzas don't sit out for long as they get pretty consistent traffic. Don't think you'll be eating pizza from several hours ago).
I think the greatest draw of this place is the unique offering on the pizza tops. One of my favorites has been the reuben pizza.
Whenever your in Madison, this is definitely a place worthy of swinging by just for the experience. This may not be the best pizza ever but it is good and it may be the most unique pizza you've eaten. Either way you won't regret your visit. Both locations are equal in my experience so just to whichever is most convenient.
Also people say the max and cheese is best... don't believe it. Go for something else, I've found that one to be a little bland for my taste.