Joined: Aug 2008
Posts: 13,138
Likes: 2,158
From: Ann Arbor, MI
Bikes: 15 Kinesis Racelight 4S, 76 Motebecane Gran Jubilée, 17 Dedacciai Gladiatore2, 12 Breezer Venturi, 09 Dahon Mariner, 12 Mercier Nano, 95 DeKerf Team SL, 19 Tern Rally, 21 Breezer Doppler Cafe+, 19 T-Lab X3, 91 Serotta CII, 23 3T Strada
Best stopping power is not the only reason to go with discs; in the wet, they're much cleaner than rim brakes, and ease of maintenance is better than anything else, though I haven't ridden a roller hub in 10 years and may be out of date with the tech nowadays, but I suspect the tech is in exactly the same place it was back then, which is to say 10 years behind v-brakes in terms of stopping power.
Speaking of which, I assume by 'rim brakes' we're all talking Vs here; you have to be a psycho/sadist to run cantilevers these days. Or some retro-cyclocross freak.