Earlier quoted context omitted.
I get the joke, and it was the first thing that popped in my head too. But in all seriousness, OS X is Unix as well, and can do pretty much any Unix based task that GNU/Linux can. Sometimes the best tool for the job is the one you already own.
Have the Mac folks got focus-follows-mouse yet? http://steve-yegge.blogspot.it/2008/04/settling-osx-focus-fo... In general, I don't think I'd ever give up Linux. It's a hacker's OS, by and for hackers. Being able to pick apart and fiddle with any portion of, from the kernel on up, is a wonderful, empowering feeling, and something that has proved useful both personally and professionally over the years.
I didn't mean any slight against GNU/Linux; I use it every day (and I don't mean on a phone or tablet either). But I also have used Macs for stuff that works better on a Mac, and Windows for stuff that works better on Windows. There isn't a "Best OS" period, because every use case is different. There's only "best for the job at hand".