I have eaten in most of the pizza joints in Toronto. I have to say this is my favourite.
WIthout the get-in-get-out feet of other trendy places, Defina is always warm and welcoming. The service is fast and the food is great.
My personal favourite is the regular-old margherita pizza. I like a classic. You can get your pizza on a fluffy or "Roma" crust. I always choose the blistered Roma. If they ask you if you want spicy oil, take it. It's so simple, but really compliments the pizza.