1.
Simple
It's simple to install a desktop application on linux. You only need one click in software centre, or one line of command to install it, no more going to the web page to see those annoying ads.
2.
Free
Operating system and every software is free. You don't have to pay money at the beginning, but you can donate any amount you want to the developer after you make profits.
3.
Freedom
If you use windows or macOS, Microsoft and Apple won't reveal the detailed details of their systems to you, and they can spy on you as they please. Everything in the linux system is under your control.
4.