Ubuntu’s “reputation” is nonsense. It’s a great distro for servers. Security updates are really fast and using snaps in a server environment is really great. I recommend running things like Docker or Tailscale off snap. They will revert to a previous image if an update fails. Extra stability for a server as you run automatic updates. If you run everything that is not in the base install off a snap, you have an extra layer of sandboxing against any supply chain attack for dependencies.
Ubuntu will have more recent packages, that doesnt really matter in a server environment. Debian is otherwise fine, I just dislike it’s installer and prefer Ubuntu’s. I found it easier to sync third party drivers on Ubuntu.
Ubuntu Pro gets you livepatches for kernal issues, which may be worthwhile. Also done without rebooting.
Ubuntu also gives you better apparmour default profiles on more things, whereas on debian, its up to you to set them up.
Debian will be exactly the same, its just more conservative and has less of those extras I mentioned. May be marginally lighter on resources for that. Either are fine.