You also have a rise ball in softball, which is impossible to do if you are throwing a baseball overhand.
The softball pitcher just has a larger arsenal to throw to the batter, and you have less time to react.
The one aspect of softball that I dislike is the slap hitting, it looks like many times the hitter is out of the box when they come into contact with the ball, therefore they should be called out and rarely are.
Softball only requires one foot in the batters box.