I personally like couch/TV most of the time except for FPS. FPS is easier on a monitor in my opinion. It makes it easier to spot people and shoot. I also like driving games on my monitor but that's because I have a ultra wide monitor. But I think overall couch is more relaxing and I enjoy watching it on a bigger screen.
How about you, SW? Couch/TV or Chair/Monitor? What experience do you enjoy more?