This SFGate article begins,
"Apple and Google just kicked off the first round of their battle for the living room. Based on what we've seen so far, Apple is in the lead. It's still early, and this could change, but it looks like Apple is making an all-around smarter bet than Google."
I haven't tried out the Google device yet. The Apple unit is decent, but it's so focused on TV rental that it makes it difficult to work with an existing library of media; between the transcoding, and tedious menu navigation... well, it's a good thing it's only $99. It's a dang cheap way to get your stuff on your bigger screens, provided you're willing to jump through the necessary hoops.