On my PC I have:
- Ubuntu 15.04 (Vivid Vervet)
- Windows 10 Pro
- OS X 10.10 (Yosemite)
- Android-x86 4.4 (KitKat)
I'm always on Ubuntu. I only use OS X when I have to port my software because it's sloooooow to boot and because I don't like its UI.
About Windows... once I had to do one thing and I got a spyware!!!!
Anyway, I don't usually need to use Windows, because I can do everything on Ubuntu, except run some Windows software of course, but the most important software works in Wine.
Windows is better in some things, though, but generally I don't like it. I don't like the NTFS filesystem (which requires defragmentation), I don't like the crappy anti-aliasing and the contrast of the colours which hurt my eyes, I don't like its lack of simplicity in general...
For example: if a codec is missing, Ubuntu installs it for you, while in Windows you have to install it manually.
If you want to write "È" you have to use the ALT+the numbers on the keypad, while on Linux you just write è with the CAPS LOCK on. There are also a lot of key combinations to write more simbols easily:
If you have Windows 10 you noticed that they finally added workspaces, but you may also notice that you can't move the windows via the keyboard. On Ubuntu, you just press CTRL+ALT+MAIUSC+↑/←/↓/→.
And there's a lot more which I'm not going to write... you'll see by yourself