Sizing chart says M is for shoe sizes 8-11, and L is for 10+.
My boots are 10 and 10.5 (different foot sizes, don't ask

)
I'm relatively new to snowboarding and not sure: is it better to get the snugger M to make sure everything fits well, or get the L to make sure straps have enough room for comfortable on off? Do L hold the boot as well as M, despite my boots being at the low end of the spectrum?
Thanks!!