I'm on the list for both. Here's what I see are the main differences.
* Baader is 1.5" shorter but weighs about the same
* Baader will have more field curvature due to shorter focal length (560mm vs 612mm)
* Baader will have more star blur due to shallower focal plane due to faster focal ratio (f/5.9 vs f/6.6)
* Baader will have slightly better resolution/light grasp but would likely not be noticeable side-by-side
* AP will have better correction (honestly it's a coin toss - I've read and seen great thing about the Baader)
* AP has a matched field flattener and telecompressor (obviously only a pro for imaging)
* AP will have a visually sharper image across the field due to longer focal length and larger focal plane
* AP's FeatherTouch 2.5" FTF2535HD may be superior to Baader 2" SteelTrack focuser
* AP will be cheaper with or without VAT (see included accessories below)
* AP comes with rings, dovetail, and Pelican case, while the Baader comes with none of these
* AP looks better (subjective - the Baader dew shield logo is awful IMO and the rings are bulky)
* AP may give higher pride of ownership (subjective - varies from person to person for sure)
For travel, the Baader has the slightest edge due to being a little bit shorter and thus fitting into a carry-on case with more padding for peace of mind. That said, AP is putting the Stowaway into a Pelican Air 1525 which fits my TV-85 (same length as the Stowaway basically) with about an inch of padding on each side. I would prefer a little more, personally, but it works. Both are roughly the same weight. Surprisingly the AP is cheaper but you have to wait for it of course.
Objectively, it really comes down to the length and whether you want the visually sharper image that comes with a slightly longer focal length and less shallow focal plane. I have use fast focal ratios just enough to know that I do enjoy having more of the field in focus with slower focal ratios, especially when seeing is so-so. I have to re-focus my TMB105 occasionally if seeing is not cooperating, but then again I won't stay out for long if I have to keep doing that, since it means seeing is poor and there's no point in observing planets/moon.
Subjectively, I think the looks and the pride of ownership make a difference. The Baader is a little ugly to me, not terribly so, but the dew shield logo really bothers me (typeface inconsistency and clutter) and the rings are chunky with garish clasps. I would take pride in owning an item crafted by a master artisan in a small field, and even if the Baader is a result of work from another master optician, I really like what I've read about Roland and AP as a whole.
Which would I be more sad to have stolen or lost while traveling or otherwise? The Stowaway, hands down. Even if the Baader is equally hard to replace or even more so, even though it's more expensive, it wouldn't give me the same feelings. I would be heartbroken to have a Stowaway stolen under any circumstances.
My choice for travel and summit tier grab and go would be the Stowaway - I would say hands down but I would still be thrilled with either of them.