It depends, really. I honestly can't seem to find any books that I actually like enough to sit down and read, though, (with the exception of the Tokyo Mew Mew manga books...) so I'd have to go with video games.
Even though I don't play them too often, I still enjoy having them, especially on road trips! I carry my Harvest Moon: Friends of Mineral Town game and GBA in my purse all the time, and whenever things get boring I just start playing it, lol. It's fun, and my mom even agrees that those games are pretty educational.