As far as bubble tea goes in Toronto, Gong Cha has some of the best. Keep in mind, they now have 2 locations and the original one up at Steeles Ave is way better than the location in North York.
I've been to this location about 3 times and I've already gotten a good tea. The taste is strong and not watered down, and they don't cheap out on the toppings.
Even when I've finished the liquid, I often have to open up the top and use a spoon to scoop up the tapioca, puffing or gras jelly.