I prefer window seat on everything but 15 hour long flights.. in that case i want aisle seat so that I can get up as much as I want without having to make other people get up
I usually don't get on buses or trains or whatever, but I do prefer aisle seats. That way I can just get up and stand in the aisle to let someone sit or get out, and they not have to figure out how to crawl over me if I can't move because someone else won't move. Or in the case of the theater, it isn't really doable when you are in the middle of the row of seats.
And I don't mind having to get up multiple times.
I usually don't have the option since there's very few times I'm on a plane, train, or whatever. Most times I'm driving my own car so technically I guess I have the window and aisle seat? I can get out whenever I want to stretch, but I don't think that would make the people behind me too happy.