Read all the posts and agree with Garth. There are just so many variables. Here are my experiences.
On my 58cm Hilsen in 2013 I toured from SF to Paso with noddle bars and found it adequate, they really made it difficult on a slow loaded climb as it was difficult to keep the load under control, and I found I couldn't remain in the drops for long as back fatigue set in. Even so I was reluctant to go with an upright bar. I eased my way in with the Albastache bars on both my Hilsen and Atlantis. On the Hilsen I had a 9cm tallux stem but I felt slightly stretched out, I have some low back disk bulging (here is the first example of differentiation between people) so being able to sit fully upright is a benefit. So recently, on the HIlsen I switched to a 8cm dirt drop which obviously brought the bars up and back. That change seemed to be the sweet spot for now. I say for now because we are all in flux, so what feels good now may be different in the future.The Hilsen is now relegated to day rides between 15 & 30 miles, I hope to increase my miles but that's my reality these days.
My 56cm Atlantis had the Albastache bars coupled with a 12cm tallux stem and I did lot's of day rambles and overnights, no long tours, like the Hilsen I felt stretched out and on a long ride I had hand & wrist discomfort. Recently, as some of you may already know I traded out the 12cm for the 9cm (from the Hilsen) then finally went to a 10cm tallux stem and believe, I'm almost certain I found the sweet spot. The bar clamp is just slightly above my saddle height with the bar ends angled down. I find I have three primary hand positions.
1. To the rear at the grips.
2. just fore of the brake clamp sometimes over the brake clamps.
3. In the so called hooks.
All three give me great riding postures. The hooks I'm angled forward to cut into the wind, and the two rear positions give my back varying degrees of relief. In the full upright position I'm not gonna be pushing for speed, but I'm not real slow just a more leisurely attitude. In the hooks I feel more aggressive and can lean in for more speed.
Between the two different setups I have to say they're both entirely different! I love them both for completely different reasons. The Hilsen is light & nimble running with next to no load other than me, the Grand Bois Hetres are light, supple and quick adding to the fleet feeling and the Albastache bars have many of the positive attributes of drop bars, keeping the Hilsen more racerly
The Atlantis with all the rack add on's feels like a 4x4 truck, solid, with great visibility and a sure footed vibe running the Schwalbe Thunder Burt's. By no means is the Atlantis a slug, I still feel the frame coupled with the TB's and the Alba' give back a supple comfortable ride without compromising too much on forward momentum.
So which one is the most comfortable? I have to say the Atlantis. Have I done rando miles? No. Have I put them to the test on a long tour? No. But based on my previous experiences I feel pretty confidant that they'll be great. I'm going on tour in July and will have more feedback on the Albatross bars and their merits or demerits.
In regards to Mark's points. Yes the bar ends can and do get in the way! Especially on tight turning. I've ridden my Atlantis on plenty of single track, tight vegetation and hairpin turns and never felt unduly hindered. There have been a handful of times when my knee knocked into the right shifter and gave me an undesired shift but never too bad. And on tight turns in awkward positions it probably made more sense to dismount or take it easy. IMO my Atlantis weighs 30+ lbs I'm just not gonna be going fast anywhere. It's all about making a conscious prioritized compromise. What do you want to achieve in relation to your riding habits and experience. Funny how with bikes at least IME it takes time, money and patience. Hope some of this helps and good luck in your discovery process.
Tail Winds,
~Hugh with a head cold here typing and wishing he was going on the swift solstice camp out tomorrow.
Los Angeles, CA