I believe it has to do with how they act within the variator. Generally speaking, the sliders can give you an advantage while minimizing the amount of top end speed you'll lose. Kinda like the best of both worlds. Has to do with thier physical shape. I'd suggest to go with performance sliders as opposed to rollers. For a carbide, I'd go with a 13 gram but top end is important to me because we primarily ride a flat track. I've gone with both 13's and 12's and while the 13's worked great, I felt the 12's took too much top end away for our style of riding.
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