In Server environments Linux is #1 at over 36%, Windows has 33% marketshare.
In the smartphone and tablet market Linux (Android) is again #1 at over 49%. Windows share is under 2%.
In the Top 500 Supercomputer Market Linux dominates the market with over 98% of the installs.
I develop software across many platforms. I find the windows vs Linux arguments a bit petty. However, we should be more careful and present factual data.
Have a good night.
Your post #5 with sources and pie charts was different. I reviewed some of the links at the source your listed. Some of the comparisons can be interpreted differently if one compares dollars vs unit sales. Others sources can vary if only comparing publicly accessed systems.
Even though wiki can be quite suspect when it comes to politics, climate science, and history, they do seem to be quite reliable when it comes to computer technology. Their data falls in line with most other sources I read.
Have a good day.