I have two different bikes I take for long rides, trying to decide which one might be best for a 600 mile pacific coastal trip; no camping, fairly light load, no rush. I keep going back and forth between these two, I've done centuries on both (unloaded).
One is a MTB conversation that's set up much like the Koga World Traveler, alumn., 26", trekking bars, suspension, comfortable, strong but slow & heavy. With a light load including all stops and misc. I might average about 10 mph over distance if it's fairly flat. 6 hrs. in the saddle day to day is ok.
The other is more classic triple touring-road bike, STI, swayed stays, 700c, drops are fairly high. More fun to ride, but not that comfortable after the first 4 hours. With a light load including all stops and misc. I usually average about 15 mph over distance, it likes to go fast.
I naturally gravitate to the MTB because it's bomb-proof, smooth and forgiving. But day after day pushing that load....I think that is going to get frustrating. The modern road-tourer seems obvious, but I'm not going out there to hammer and I'm likely to get caught up thinking about daily distances and speed and miss the journey.
Given your experience, whch bike would you pick for a C-C tour and why?