Honestly both are great ways in and you'll understand aircraft way better than most pilots ever will, which is actually a huge edge later. Avionics is probably easier to pivot out of if you ever need to since electronics skills travel, but if you're more of a hands-on person maintenance just feels more satisfying day to day.

The plan B degree thing is solid advice pretty much anywhere, though Quebec specifically has a pretty healthy aviation maintenance scene around YUL so you're not exactly stuck if you go deep on the trade. Still, having something transferable never hurts no matter where you land.