My last place had a roller door. When closed the curve of the roller at the top meant quite a bit of air blew in and out, garage was always cold (I had an unrealised "plan" to build a box around it).
Also, that became a rain trap and I could see the door rusting out, along a line where the top of the doorway was.
My current place has a sectional door. It's great - "seals" well, doesn't have the tilt-door-bang-car disadvantage, and doesn't have the rust trap of the roller door.
Measure once, cut twice. Practice makes perfect.
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