I use Btrfs for my root partition to be able to rollback if something goes wrong after update. XFS: in all other cases, since I hate the lost+found directory on ext4. Although I don’t think there’s any significant difference between ext4 and xfs in performance and reliability.
At least, https://social.kernel.org/objects/60bcac97-e7c7-4899-a1b6-bb72196cddaf