I would say there is one difference, which is that you may or may not have data access. I've been traveling internationally for over 10 years now, and never had

I would say there is one difference, which is that you may or may not have data access. I've been traveling internationally for over 10 years now, and never had cellular data when I would travel (thanks ATT), and most airports would have wifi, but different subways/trains etc don't. And I've been in a situation of relying only on GPS and hoping the app doesn't shut down while I'm walking somewhere far too many times. Google has improved here with their offline maps, but even then, it's not 100%. I'm not saying that PT is worthless or that we shouldn't improve it, but IMHO, Uber and the like fill a very critical "last mile" kind of problem that I think pairs nicely in cities with public transportation.