Part of why I don't take 91 is to avoid the A-10 in Quebec as it's a very shitty highway; it's very congested, slow moving, and just a poorly maintained highway in general not to mention all the sharp turns. That's why I just prefer taking the A-35 instead (the highway that leads towards 89), as it's very straight and flat, unlike the 10, but the reason that I mostly like it better is just because of how quiet and dead it is, especially once you pass Saint-Jean-Sur-Richelieu. It has to be the one of the quietest highway's I've ever driven on in Quebec, you can do 140 km/h really easily on it, whereas on the 10 it's not even possible to do 120 most the time because everyone is only doing 100, even in the left lane.