To me the hpi silvers are a more consistent pairing usually. Also even though the rates are nearly identical I find that the reds have a more progressive feel and I actually prefer them on a more bumpy track. Sometimes when switching to rides the car has more bite on power but tire wear is very heavy.

It's crazy because the rates are identical but like Schumacher greens the feel is very different and that's what matters. I would stick with hpi silvers. You can't go wrong with them