IMO, for all round road use CR500s have it over anything else I have tried. The thing that makes them stand out is how much lighter thay are than any of the competitors which translates to a much better ride. They have a great compromise between dry and wet grip and they don't tramline.
FYI I have also tried A021R, AO48R, R888 and Kumho V70A.
Now for track use...
Yellow SL #32 - member of Drowned Rat Racing