I prefer driver's side. That is the way most people seem to have it in the US, so when I pull into a busy station, all the spaces are occupied by people with their car parked driver's side next to pump, so I have to pull in facing their nose, and someone else inevitably pulls in facing their tail, so while I wait for them to pull out past me, said third party pulls forward to the pump. Irritating.
I used to have a car where the tank was in the middle, under the license plate, that way you could pull in on either side, best plan of all. Why it should be on one side or the other I have no idea!