Looking to get new equipment and looking at coverstocks in storms lineup, does anyone really know the difference between the R2x, R2s, and the R4s covers? it would also help if anyone could maybe list what they believe is the strongest cover to the weakest. I'm looking for a solid cover so you can leave hybrids and Pearls out of the list. Also when I say strongest i mean the coverstock that would help the ball roll earliest not left to right movement.