My vote is shed. Both my brother and I had remote ranches near each other, I had a 28' trailer and he had a shed,
both used while we built larger homes.
Trailers fall apart fast, get infested by mice, generally aren't insulated well. They get pretty noisy in storms and wind.
All it had going for it was pluming and electric were pre-done. Plumbing stuff on the trailer broke constantly, and
about 4 months out of the year you have to leave antifreeze in or risk breaking even more.
The trailer cost 4 times what his shed did.
Once he shed was built he insulated it with thick styrofoam panels, and we set up a tiny solar system. Chemical toilet handled
that. His place was way more comfortable, cheaper, and while it didn't have plumbing, there was nothing to break, either.
Bed was a normal bed, if you needed heat a Buddy heater took care of it.
15 years later, my trailer was falling apart and his shed became essentially a small guest house and is in perfect shape.