I don't try to get people to change operating systems, any more than I try to get them to abandon their religion -- that's a young man's game. However, linux gives me more value. If I was still using windows, I'd have a harder time customizing it to fit my tastes. And although windows strives to run older software in newer versions, linux actually does a better job of it -- the caveat being that you may have to compile something now and then.
And while I appreciate being able to run a stable system with a distribution like ubuntu or debian, it's much more fun to tinker with things in gentoo. My gentoo systems don't run systemd, dbus, consolekit, polkit, or elogind. In the (very likely) event that anyone doesn't recognize those names, they're slightly controversial projects that most linux distributions use by default. I can choose whether or not to use pretty much any software that makes up the operating system, which saves me time patching bugs (but mostly just gives me bragging rights).
My linux "desktop" is pretty much non-existent -- no taskbar, no icons, etc. I figure any time you spend looking at the desktop could be better spent looking at an actual program. I use key-chords to start my favorite programs, and generally start anything else from a shell. I'm sure I could find something similar for windows, but it probably wouldn't be included in the installation.
However, when I look for a new laptop, I have to spend extra time ensuring that I can find hardware drivers for it -- you can almost always count on windows drivers. I can't realistically run some games. It's nowhere near as easy to use hardware security on my computers, since I'd have to sign the kernels I compile, to get the hardware to recognize them. I suspect that there are nice programs that don't have a linux equivalent, though it's been so long since I touched windows that I can't think of an example.
But I think that the best thing about linux is just the feeling that I get when I realize that 99%* of the software I'm using was made by people who didn't worry about making a profit. They just had an itch to create new software, and were happy to share with everyone.
* I have some for-profit games, and one utility (makemkv) which is technically for-profit, but seems to be in permanent beta testing.