I had a very long drawn out discussion over this.
Pizza is like sex. Even when it's not that great, it's still pretty good.
The BEST pizza is not necessarily the 'Best Pizza', but more like "situationally" the best pizza (Usually based on how hungry and drunk you are).
So the best pizza's are usually the places open at 3am, while you're a stumbling puddle of a person.
That said I would have to agree that Chicago Deep Dish is the best Pizza in Edmonton ..... "when you're drunk past closing time and looking for a layer of grease".
Best deliery is Panago.