I have a gaming desktop, a big laptop(17" screen, dedicated GPU), a 10" Samsung tablet, 7" Nexus tablet, and a (5.5") Note 3 Phone.
I always bust out the laptop or get on my desktop if I'm actually interacting/typing a decent amount on a forum(like now). Touchscreens & auto-correct just absolutely blow for typing out more than 1 or two sentences(anything longer than a text), I need a full keyboard for that regardless. Not to mention trying to do advanced things like copying/pasting text or quoting previous posts, that's frustrating as hell on a touchscreen device.
That being said, If I'm laying on the couch and watching TV and just want to screw around and read stuff online as well, that almost always defaults to one of my tablets. The 7" Note is easy enough to hold with 1 arm if I'm completely laying down on my back or whatever, but the 10" tablet is definitely easier to read, and I'd rather use it for web browsing, but I pretty much need to lay it in my lap for using it at length, which is no big deal if I'm sitting upright in a chair or whatever(the 10" tablet has a flip cover that props it up like a laptop screen).
I'd say that anymore, 100% of my TV and movie viewing is done with a tablet in hand. I'm always wanting to look up an actor on IMDB, or google something about the show or characters. It just adds so much more to the viewing experience to see something happen, think of a question about it, and instantly have the answer in your hand rather than sitting there and wondering about it for the rest of the show. I hate watching a movie where you see someone, you recognize them but you can't think of what else you saw them in, and it bugs you for the entire movie. Now I can fix that in 30 seconds or less.