It's just an educated guess. For general stats (http://gs.statcounter.com/#desktop-os-ww-monthly-201509-201511-bar http://gs.statcounter.com/#desktop-os-ww-mont

It's just an educated guess. For general stats (http://gs.statcounter.com/#desktop-os-ww-monthly-201509-201511-bar http://gs.statcounter.com/#desktop-os-ww-monthly-201509-2015...), 90% of the world uses windows while 10% use macs. This reflects directly at companies and large development teams. For developer stats (http://stackoverflow.com/research/developer-survey-2015#tech-os http://stackoverflow.com/research/developer-survey-2015#tech...), 54% use windows, 21% use macs. I'm not stating that these stats are the ultimate sources of truth. But those are good references. If you were to measure the reality in most countries, I doubt those numbers would swap places. In Brazil I see lots of devs using Macs too. It's just not the majority of them.