For one thing, snaps.
More options and configuration flexibility, longer support historically from the community, including security, etc. If youre going to do a huge dist-upgrade, you’re bordering on reinstall territory as is, which is why I mention it.
Ubuntu will be more willing to incorporate newer updates more quickly, Debian will be a more consistently stable upgrade path, avoids unnecessary services from install so less attack vectors and less security update needs from the jump.
Hey, you do you. Good luck with the upgrade.