I think both are very productive platforms. I use both, but for me Mac OS X is better. The big reason for me is that there are apps I rely on that run only on

I think both are very productive platforms. I use both, but for me Mac OS X is better. The big reason for me is that there are apps I rely on that run only on Mac OS X. Keynote and OmniGraffle are the two biggies. Also, I find things "just work" on OS X. I spent an entire morning configuring my dual monitor setup on Ubuntu, for OS X there was no setup. Also the instant sleep is a killer feature for OS X.