It's pretty tough to a buy a run of the mill laptop (as I do every few years) without Windows pre-installed.
I have been triple booting Windows, Ubuntu, and Arch linux all from the same laptop for the past few years now and loving it.
Windows is great when I need stuff to "just work". For example, when I want to quickly plug my laptop into the hdmi cable to watch a movie in better quality on my TV. Or if I need to quickly print out something on a random printer the plug and play features built into windows are amazing.
I spend most of my time using Arch Linux, with Ubuntu being my fallback if I really run into trouble (Arch can be... finicky. But I wouldn't use anything else.) with what I am trying to do with linux.
I would probably have OS X on there too if it came for free with my laptop purchase to be honest.
With an SSD Hard Drive any operating system you desire is only a reboot and 15 seconds away. So why choose?