The Supple Vitesse EX 33 is fast and has a nice ride, as long as air pressure is kept in a fairly narrow range. Mounted on Open Pros at my 205 lbs, that was about 65 psi front, 73 psi rear. Just a few psi less and it started feeling more like a Pasela. On Open Pro rims, the SV has never measured more than 31.5 mm in width. A wider rim could add a few mm in width.
The Vitesse EX 38, on the other hand, does feel plump, rides plush, is as fast on the flats as a GP 4000. Mounted on HED Belgium rims, it measures 36.5 mm. The large air volume is much less sensitive to air pressure, which is nice not just for speed and ride quality but also not having to pump it up every couple of days.
Would be fun to try them as a tubeless setup.
Cheers,
Bill in Roswell, GA