So, you’ve decided that even if you are just driving yourself most of the time, public transport does not fulfill your travel needs. Neither do car sharing services, regardless how smart or convenient they are. You need your own car and you need it at your beck-and-call.
Therefore the question is, what size car do you need?
You need space for yourself, your bag, maybe some training gear and, from time to time, an overnight bag. Sometimes you may have passengers, but rear legroom is not a determining factor. Using these criteria, a small or mid-sized car would probably hit the mark.
Perhaps your professional or private life means you need more space for stuff. Big and bulky stuff. Like a surfboard, or a golf bag, or even your small-bear-sized Newfoundland dog. Or work things like ladders or tools for craftsman; tripods, cameras and lights for photographers; or dry suit, oxygen tanks and the rest of your gear for professional divers. In this case a larger sized estate or even an SUV could be the car for you. Cars that offer flexible loading options or boot space – maybe even with an integrated dog cage – would be a good choice. Your car should facilitate your life – not put limitations on it.