I've searched but I don't see any real comparisons between the two. They are comparably priced, one comes in colors and multiple sizes and the other comes only in black and 23mm. If you compare black to black, both have the "black chili" compound and Vectran fabric. The 4000S is marginally lighter. Both claim reduced rolling resistance, increased grip and increased tread life.

Does anyone have direct experience with both? Is the difference worth commenting on or worrying about, or should I go with the one that looks better?

Thanks.

-soma5