Off only the top of my head.

-Potentially faster installation

-Free

-More control

-Many distributions from LinuxFromScratch to Mint, making it meet the interests of nearly every demographic

-Wonderful sense of community

-No spying

-No bloatware depending on distro

-No ads

-Many window managers supporting different workflows

-Incredible command line power

-Easy installation of software with package managers

-Less malware

-Fully customizeable ux/ui

-Can uninstall anything you don’t want

-Will help you learn how a computer works at a deeper level if you want to