Somewhere along the way, Linux stopped being the place cool stuff happened. On the server side, Solaris has been sexier for some time. On the desktop (where I spend most of my time) OS X seems to be the only place where innovation is occurring.
I think part of the reason the Mac is more appealing to me these days than Linux is that OS X has figured out how to create both a viable open source and a viable commercial software ecosystem.
Here's a graphic illustrating what I perceive to be Apple's platform advantage:
