I think the baby Taylor has an easily removable neck. Just remove two screws around the 14th fret. With the neck off, you could easily transport the body in a hardshell suitcase. As to which one sounds better, I don't know. Neither of them will have a lot of bass with the short strings and tiny body.
FWIW, the mini Martin can be bought with an on board amp and tuner which is handy if you would like to boost the volume through an amp.