Debian is one of the oldest and still standing Linux distros. It's a good distro, you can use it for pretty much anything like gaming, office work, servers, coding (like i'm doing right now).
Anyways, why should you use it ?

It's free and open source so i think it's a little bit better than the 50... WAIT HOLY CRAP THE PRO VERSION OF WINDOWS COSTS 200$

You might be saying "Windows is already compatible with all the software", and you'd be right. I know it seems weird to say in a Linux appreciation website text-thingy
BUT compared to most other linux distros, it has a big software availability coming from big enterprises. That's mostly because of the fact that Ubuntu, one of the biggest linux distros is based on debian and also uses .deb files. It also has one of the biggest stable software repos in the world.