If it's eating the teeth, I would start checking alignment and other issues like chain/sprocket fitment. Easiest way to keep the chain true, get a Round House carrier/arm combo. Keeps shit hüber tight.
As far as who the most durable, I would agree with Cam. I have had nothing but awesome luck with the sidewinder stuff but it is pricey. Other then that I have dabbled with the PBI and Sun Star. The Sun Star is on my bike currently and holding up well. Heard a lot about the Sprocket Specialists, but I've also heard about a few guys having trouble getting orders after paying.