It's easier. You need enough room for the nose to swing around because the front wheels follow a wider trajectory than the rear wheels. The access road is usually much wider than the parking spots, so backing into the spot gives you much more room to maneuver.
You also have much better visibility overall. If you go in nose first, you can't see the front corners of your car, and you also have terrible visibility when backing out of the spot. If you back in, the mirrors show you exactly how close you are to the cars around you, and you have an unobstructed view when you leave.
It's easier. You need enough room for the nose to swing around because the front wheels follow a wider trajectory than the rear wheels. The access road is usually much wider than the parking spots, so backing into the spot gives you much more room to maneuver.
You also have much better visibility overall. If you go in nose first, you can't see the front corners of your car, and you also have terrible visibility when backing out of the spot. If you back in, the mirrors show you exactly how close you are to the cars around you, and you have an unobstructed view when you leave.