Whenever I have friends coming to town from out of the province, I bring them to La Banquise. This place is open 24/7 and is almost always jam packed. The few times I went, there were always a line so nowadays I just make my life easier and order a take-out. It's at least twice as fast, I get to avoid the noisy and overcrowded tables, and the poutines are just as generous.
The portions are huuuge. The poutines are very rich with gravy and the portion of cheese and meat on each one is more than worth the price. The fries are nothing spectacular but they were also excellent. I would recommend being a bit adventurous and wander outside the Classic for some of their more exotic offerings since that's what they're known for.