depends on the movie theater. The one at our beach house is really cruddy Colin dark screen, sticky floors, uncomfortable seats, and a really crappy sound system. In that case a pair of headphones and my samsung phone make a better alternative. The 1 at home however, is really nice IMAX theater, brand new, comfortable seats, amazing screen and sound.
I watch a lot of video on my devices. I have a Plex Media server setup at home and Netflix account as well as Amazon Instant Video. I usually slip between using my 7 inch tablets, 10 inch tablets, and smartphones. The advantage with streaming is that I can easily pause and pick up on another device as needed. I watch all my video podcasts on my phone usually due to portability. It does better when you hold it in front of your face no more than 18 inches. Tablets you can just set up on the desk and watch them on the side why you're doing something else.