I don't know...self-exile, shipwreck, incarceration, foreign work with a small apartment, long backpacking trip/RV trip or truck-driving gig, whatever, and you could have one houseplant to keep you company, what would you choose, and why?
Assuming adequate light and moisture requirements could be met.
I think mine would, of course, be Swedish Ivy, Plectranthus australis.
It'd be nice to have something that blooms (they can but mine NEVER have), or was fragrant, or could provide visual entertainment like a flytrap or sundew.
Or get huge and decorate a wall with something vining.
But I don't think so, hopefully I never have to make a choice.
Love the stuff.