I did my Poutine challenge all over Montreal and there were several increbile poutines that I was most pleased with. La Banquise was the best.
The plain, old-fashioned fries-curds&gravy poutine was fantastic there. I totally ate that and realised that this was probably the best straight-up poutine I had on my visit, but then I tried the BOM and that just sealed it. It was incredible and my visit was a success because I'd found the perfect poutine. I'd tries at least 8 different poutines that week, and this was the best.
Oddly enough, it was recommended to me by a taxi driver who also pointed me to a bowlign alley that did a pretty good one too!