No. 1 Red Clay in France, Belgium and Germany
No. 2 Red Clay Italy, Spain (different make up)
No. 3 US Har Tru (both the traditional and newer American Red Clay product play about the same)
Hard courts a necessary evil in the states - slower the better
Grass last as unless its well maintained its horrible - playing on grass at La Quinta or at Queens - Wimby special as its manicured and maintained. But others at lesser resorts or clubs (Westside in NY as example) rough and weedy...yuck! Best part about grass is playing barefoot...that's cool.