I have to say every time I hear a 15 - 20 handicap talk about the dynamics of different golf balls and how they affect their game I am forced to shake my head. Perhaps I was different, but when I was first starting out I could have played any ball and it wouldn't have mattered.
People of that skill level do not make consistent enough contact to worry about what ball they are playing. When I was a 15 handicap I was just trying to get the stupid thing off the ground and in the general direction I wanted. Hell, even now I bet playing a distance ball wouldn't affect my scores all that much.
Look, if someone wants to play a premium ball, go for it. Premium balls do work better, for everyone. But, IMHO the difference for anyone other than the very good player is not worth the cost.