After sampling quite a few other poutine places in Toronto, I've definitely figured out what's so different about Idea Catering's - their gravy. It's so ridiculously beefy; gravy in other places tends to be more mild and thicker. Ideal Catering's gravy hits you right in the face with its strong beef flavor.
Also, try the fries without the gravy! They are deliciously crispy and salty, perfect for a post studying midnight meal/snack.
Love this place. The lady who runs it is Turkish and just soooo nice.