Palio 3*** vs 2**+ vs 2** Plastic Balls

[jasonxian24]

Hello! I have been researching about the new Palio balls and stumbled across these weird and new Palio balls. I have all three of them but can't seem to see the slight(or extensive) changes between them. I was just curious and I want to extend my ball(plastic) collection. 2**+?
WHAT IS THE DIFFERENCE?

Thanks,
Jason X
P.S
This is my first fourm.