Given whatever size of garage I have, being somewhere I can live without a car gives me more garage space, regardless of whether it's a suburb. If I want to maximize garage space given my choice of a car-free lifestyle, I would probably move to a suburb with a good train station, not one where "only 20 minutes' drive to downtown" is seen as the selling point. Those are subtly different kinds of places, in my experience, where most people are going to fill their garage space with cars.