I now have both corns and balls, and I must say the corns are much better as a first snake. Their feeding responses are un beatable and so far all three of my corns eat like garberators. My ball on the other hand, like most, is a very picky eater. I only very recently got him onto rats..and it wasnt easy.
If this is your first snake get a corn...if you've had some experience with snakes before then you can try a ball. They are great snakes but imo corns are a better first because it can be frusterating or a bad first snake experience when your ball goes on a hunger strike for 5 months!