What is it you want to know? “why do you use Linux” seems like it assumes something about what you might want to know.
Like, why Linux and not MacOS/Windows? Or, what are the Linux specific stuff you use it for? And when you say “Linux”, I’m sure you don’t mean the kernel, but likely Linux kernel + some package manager + some window manager?
The answer to a lot of these things are true statements for me, but will come across as incredulous. They are:
Gnome is a more consistent user experience over both MacOS and Windows. Gnome 9/10, MacOS 4/10, W11 3/10.
It is the actual “just works”. (the list is looong)
It’s much more usable for power users.
Are the main ones. I cannot think of a single thing either MacOS or W11 does better, that isn’t “well, you can run X software on it”, which is a fair argument and likely a valid deal breaker for many use cases/professions. But also not really the fault of the OS. And there are many, many reasons why MacOS and W11 are a pain to use.