Having fought bent rims all my life, I'm interested in building a road bike with disc brakes. I have either carbon or aluminum frames that I can weld the mounting bits to. Alternately, I can buy a frame with disc mounts already there.
I would prefer to build rather than buy because all the disc-brake road bikes I see (Specialized Sirrus, Giant OCR Touring, Cannondale Cyclocross Disc, etc.) either have low-spoke-count road wheels or 700c by 28mm mixed-use wheels. I specifically want 36-spoke (or more) wheels with a 20mm-wide deep-V rim profile. No production bike with disc brakes offers this, and the LBS is unlikely to swap out on what I want.
Now the question: I can buy a hub-disc-rotor set for mechanical discs significantly cheaper than I can buy the same set for hydraulic discs. I understand that for mountain bikers, who decend continuously, the hydraulics are more reliable and preferred. Would there be any significant safety or functional difference on a road bike? For purposes of this question, assume 6" discs.
Thanks for your patience with my repeated questions.. I appreciate the responses I get and have become significantly more bicycle-educated by reading them.