For privacy and "FOSS ideals" stay away from Ubuntu and RedHat.
For "easy for a Windows user", I tried switching to Linux 6-7 times over 15 years, different distro every time.
The one that finally "stuck" for me was #Mint.
Although honestly, nowadays, most of the top distros are very good. I'm also a fan of #Pop_OS
just got added to my desktop wallpaper collection.
Now I need to figure out the best way to add it graphically as an email signature...