What you talk about in the first paragraph is not really a preference, it's the lack of one. Depending on the game and what system it releases on, you play it on one console or another. That's not a preference, that's the lack of one.
Also God of War isn't a good example, you can't play it on a viable portable. You said it yourself, the Vita streaming doesn't work well for you.
Edit: Leaning towards portability IS a preference because that means in your general gaming life you prefer one solution over another.
I think you are reading WAY to much into a single word. XD