Definately the gym...one of the most entertaining parts of my day is laughing at all the people who have no clue what they are doing...ok, ok, we were all like that at some point but some of these people are so ridiculously funny. And while I'm not there to socialize, I love having people around all the time and the overall atmosphere as opposed to a treadmill and home gym system I'd have to put in my dark, ugly basement.