[caw]

Con: *NIX software isn't as easy to install. I mean there's stuff like brew and ports, but it's just not the same. You have to sit there and compile and then oops you have a problem you need to go fix. For instance, postgres9.0 on ports has a bug where you have to specify the hostname, so you're doing psql -h localhost just to bind to the local database. I hear brew is better but there's an opportunity cost to switching and making sure everything installs.

No hibernate option, not that it always works in Linux.

Pro: No Unity interface :). I jest, but some people don't like the UI and that could be a pro for you.

Mac App store is definitely a plus, but apparently Ubuntu has one too.

You can use Xcode and be able to play in the iOS sandbox.

[dextorious]

"""No hibernate option, not that it always works in Linux."""

Actually there is a hibernate option, and it's enabled by default too. It's just that it's used only as a fallback (from normal "sleep" mode which is way better) when the battery dies.

OS X also saves to disk (hibernates) after you close the lid, so if when sleeping the battery dies, you don't loose anything. So, you get the best of both worlds --sleep for normal use PLUS hibernation as a (transparent to you) backup.