Because I enjoy long hours in the saddle, most (but not all) of my bikes have been ridden decently long distances. I know you asked which
one gets the nod for distance, and in my case that would be my kind-of-off-topic Boulder Brevet, which is pretty much designed for that specific task. I've got 700 x 32 Compass Stampede Pass tires which I like quite well. With bag and racks, the Boulder weighs in around 26-ish pounds (perhaps less - I haven't weighed it since building up a new wheel set this summer), and I can roll all day. I credit the tires and wheels, as well as the fact that the geometry and sizing were customized/optimized for me, and that makes a huge difference from - literally - any other bike I've ever ridden. Oh, I also have a Cambium C17 saddle and VO rando bars, 48/34 compact front with Shimano m324 pedals: the points of contact are important considerations too.
On the C&V side, I've a 1971 Raleigh International reimagined as a three-speed road bike. It's often been shown on these forums, and weighs in around 24 pounds (not including racks). Vintage and well loved Brooks Pro saddle that fits as only a saddle can that one has been sweating on for a couple decades. I can easily do 50 and 60 mile rides on this bike, with the occasional foray into longer distances. Racks and saddle bag and lighting make this a practical choice. Excellent fit and ride quality round things out nicely. I've got 700 x 28 Gatorskins on this bike - pretty much bulletproof, hard as nails, and surprisingly comfy relative to my other experiences with Contis.
For a little more spirited ride over distance, my 1989 Paramount is a good choice. A few pounds lighter, mostly because no fenders, bags, or racks. I run Serfas SECA tires in 700 x 25, with Campy triple and a Cambium C17 saddle. Easy bike to ride a century over rolling hills, and it handles sidewinds quite nicely. As with the other two aforementioned bikes, the frame size is a good match for me and I've optimized reach to my riding style so that things are comfortable over the long haul. Haven't weighed it in a while, but call it 21 pounds I'm guessing.
Mid-80's Katakura Silk has been on several long rides, including an east-to-west journey across Nebraska last summer. Until recently I never had tires on it that really made me feel like I wanted to spend a day riding. The Vittoria Rando tires I'd been running were quite hard and telegraphed the road into my hands, and at 700 x a very narrow 25 I just wasn't finding them encouraging (although they
look great!

) Anyhow, I recently turned this bike into a 650b and it's miles and miles more comfortable. This being my second 650b, I've found that once I've gotten over the initial "drinking of the Kool-Aid," the jury is still out for me on the size. Magic carpet ride? You betcha. Plush? You know it. But I always feel the "spirited" part of the ride is missing. This is one heck of a bike for around town riding, picnic riding, shorter carry-stuff-with-you rides of ten or twenty miles. I'll select another bike for the long road, though. I need to weigh the 650b conversion, but my scientific wild a$$ guess is right around 26 pounds.
Hope this is helpful information.