I'll answer "home". Particularly in the playoffs, I find I enjoy the games far more if I can sit alone on my couch and really give it the attention it deserves. I don't want to come back from commercial and still hear people chattering about how funny that McDonald's commercial was, or (god-forbid) how cute Tom Brady is.
A lot of people like to watch in big groups so they can drink in the energy and feed off each other, and I understand that. I was in college during the Sox run in '04, and made the mistake of watching with other people, who tended to be as much of a distraction as anything. Now when the big games come along, it's just me on the couch (maybe with one or two equally dedicated Pats fans), and I like it that way.