What I like most about the Nexus 7 is the soft rubberized backing. I'm not constantly worried about scratching it, I can toss it around more, but it doesn't require a bulky, obnoxious case. Have you seen those sci-fi movies where people just have tablets laying around everywhere, like people have documents and books laying around now. That's what the Nexus 7 feels like.
Most every other computer, tablet, smartphone has to be managed. I have to worry about where I set it, where the case is, where it's plugged in, whether I'll drop it, etc. I don't feel that way about the Nexus 7.
I'd rather have iOS and the iPad's battery life, but I don't want my tablet to feel precious.