There are good reasons for reversing into the parking place - for one thing, safety. So, there is a free parking between a row of other cars, facing a wall or some bushes. On arrival, one has full oversight of the parking place. Reverse in, the probability that one accidentally will drive down a child or a biker or some pedestrians or hit some other vehicle is extremely low. When driving out, one has good visibility and can maneouver freely.

Now, drive head-in on the parking, and one has to reverse out again. This tim it's different. For one thing, it takes some time to enter the vehicle, find the key, start the car, etc ... enough time that sort of anything can happen behind the vehicle. In addition, you're reversing out on the road, with other cars, pedestrians, children playing, etc. You're sitting with your head far away from the passing traffic, and it's difficult to see if the road is clear or if there is a bicycle coming at full speed. Compared to driving head first out of the parking, it's actually quite a risky operation to reverse out from the parking.

So ... wrg of safety, it's best to reverse into the parking and drive out from it.