Not from Montreal, but barring airport specific reasons to use specific runways (like terrain or noise abatement), which it doesn’t look like Trudeau does, it’s going to come down to wind direction or traffic flow etc.
For example right now it looks like there’s a 10kt headwind for runways taking off over the water so it would likely be preferred for takeoff barring the above.
Not from Montreal, but barring airport specific reasons to use specific runways (like terrain or noise abatement), which it doesn’t look like Trudeau does, it’s going to come down to wind direction or traffic flow etc.
For example right now it looks like there’s a 10kt headwind for runways taking off over the water so it would likely be preferred for takeoff barring the above.