All distros are equivalent, as far as software is concerned. They all have access to the same open source software, and Flatpak; AppImage; and Snap can be used for extra portability.

Think of a distro like a pre-configured image of linux. You can always change the configuration later, if you desire. For example, the Desktop Environment. All you have to do is just install a different DE package (usually via command line)

The DE has a major impact on user experience. Use KDE plasma for a more windows-familiar experience, or Gnome for a more Mac-familiar experience. Or experiment with others

The Linux Experiment is a good resource

Linux is already at 4.5%

https://gs.statcounter.com/os-market-share/desktop/worldwide/

I feel like that would cause false positives

Then again, not that many people mess with their router