Given that the material is equal between a roller and slider, the slider weight will last longer because the additional surface area distributes forces and wear across it. The down side of sliders is additional friction in the ramps against the slider surfaces resulting in slower CVT response to engine speed changes.
Everyone's usage will be different, but I replaced twice as many rollers as sliders until I went exclusively to sliders. My riding is either tight technical trails or loose open sand on elevation variations - Both require high levels of torque, but the sand demands it almost constantly. I rarely have level hard packed fire roads where I can just cruise and hold partial throttle over any distance.
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