Why not both? I love the idea of having console games to go. Like most people, I've been wanting this for years.
Though if I had to choose one, yeah, television all the way.
Both but mostly the console screen, whether I'm on the go or not. I can't sit in front of a TV for very long and I like to sit or lay on my bed when playing video games.
TV for sure, especially during my first play through. Because the world is so huge, I want to be able to see it all on the biggest screen I have available.