I back into spaces almost exclusively. reason: I see that I can do it when I arrive, and realize that exiting forward will be a breeze regardless of the future conditions (you are backing into an empty space, and forwarding into a space with other moving cars that are out of your control).
it's one forward lap and one backward lap, same difference, in addition to which I find steerability/maneuverability is much better with the "steering" wheels in the back, because after you get the forward aligned to enter the slot, you can simply steer away after that.