I have both types of drive, i.e. 4 wheel drive and rear and front drive. In fact, the rear drive has less slip, especially when the basket is loaded, compared to the front drive. However, for me, mowing a plot of irregular shape is more convenient with a mower with front drive because with obstacles and tight turns, I do not have to turn the drive on and off, I just gently lift the wheels and then lower it further driving.
This is just a great thing for me, of course if someone has a large plot of regular shape, it does not matter that much.