It could just be my lack of taste (no pun intended), but I've always found The Big Three to be mostly on par in their own ways, and I've had pizzas from all of them at different points in time and in different locations.
Pizza Hut edges it slightly for me, though, because I prefer their thick crusts over the other two's not-very-thick 'standard' crusts.
With all that said, my local independent has always been consistently better (not so local anymore since moving out, but hey-ho!)