Hola Gregorio,

I've got a set of both Thesis and F20's built on AC hubs. I used Sapim X rays, but any decent spoke would be fine in this application. DT, Wheelsmith, you really don't need anything too fancy if you're going 32 or 36 spoke.

The Thesis is a better "all around" rim. Very nice machined braking surfaces, they stay true and have a nice ride. If you are getting them from Ital-Techno be aware that they had the rim height incorrectly marked (they are around 28mm).

The Cronos are 100 or so grams lighter but are a very stiff alloy box section that transmits a bit more road vibration and are prone to high spots and going out of true on a regular basis. They are coated so the brake feel and surface isn't superb. I use them for climbing. At 1340 grams for the set they are really light, and with tires they were 1/4 pound better than my AC Sprint 350 clinchers.

If you have any questions PM me.