You know - if you're only looking at the NWT because it happens to be there, that might be your answer....

I don't know that I'd fold a NWT going up and down stairs. I used to live in a condo where coming in meant up one flight, down one flight. I never folded. I would ask about bike weight, and be a bit more concerned with that.

I do think the Tikit is significantly easier to fold. If that were my only consideration, I might get a Tikit. If I needed to take a bike on public transportation daily, I'd take the Tikit. I wouldn't want to fold/unfold a NWT multiple times a day. The "issue" with the NWT is that the handlebar/stem area is sort of hard to manage when folded. It does what it's intended to, but it's a bit harder to velcro/etc. than I believe the Tikit to be. If I were going on ride criteria, though - I'd go with the NWT.

How long do you think your out of town trips might be? I wouldn't put a limit on the Tikit, but my DH has done back to back centuries on his Crusoe (and I've done rides in the 50 mile range). You can always grow into a bike