It's Dominos. What more is there to say? Their pizza is good, their prices are surprisingly cheap for the quality and amount you get, especially compared to other places in town. Their online ordering is the most streamlined among practically any pizza place in the Province, never mind just Georgetown, and their delivery is always very timely.
The only downside is the size and price of their gluten-free pizzas. It's locked to small size which is smaller than most places, and the price for it is very expensive relative to other places as well. The quality of it however is very good and it's difficult to tell you aren't eating normal pizza crust, which is much more than you can say for some other pizza places in town.
Unlike Pizza Nova they also don't have dairy-free cheese which is an oversight as that market is growing rapidly, however in every other way Dominos is actually pretty good.
Pro-tip: Use their online coupons (or physically mailed ones if you have 'em), it's win-win.