It’s my choice but Arch and its derivatives look like the trend like CachyOS which is #1 right now on visits on distrowatch. Also I’ve heard Google use Debian as gLinux and I feel many other giants also use it and sponsor it and I’m not comfortable choosing it as my distro. Can the sponsors togethwr with students or any other interested use it for their PCs, either coding or ordinary use? It strictly promotes free but worried about giants and sponsors.
They use Debian for the same reason all heavy industry is built using steel and not whatever flashy new composite is in the news today. It works. Debian is slightly harder than Ubuntu / Mint to install and set-up, but probably the easiest to maintain since it is extremely stable and forgiving. It will also work on just about any hardware.
And don’t worry about the sponsorships. Debian is run by the community; the sponsers don’t get to decide anything.