From what I learnt, borg has least problem of all the open source backup software with the most wanted features (encryption, dedup, compression and rotation) and others all have their quirks, be it huge memory usage, data loss to worst being corruption of the backup repository.
Things may have improved since I've looked but you want user feedbacks saying so.
It's too late to know that backup software has been failing when you need it as the original data is already unavailable, so choosing by the look of landing page is a bad way when it comes to backup.
kopia is still new and last time I used about a year ago, it still had basic problems, so I would never use it in place of borg.
restic, duplicati, duplicity and duplicacy all have some sort of problems especially when the repo gets large but of course there are cases where things are working fine.
https://forum.rclone.org/t/rclone-as-destination-for-borgbac... (Restic issues)
https://www.reddit.com/r/Backup/comments/opu1ep/comment/h67n... (Kopia issues)
https://forum.duplicacy.com/t/memory-usage/623/24 (Duplicacy doing a big rewrite of the engine to fix memory issues.)
https://forum.duplicati.com/t/is-duplicati-2-ready-for-produ... (duplicati stability issues)
https://www.reddit.com/r/unRAID/comments/eg0zpe/duplicati_se... (Another duplicati issues)
borg also has change logs with any major reliability problems mentioned up front which gives you more confidence than serious bugs buried in GitHub issues like other tools.
https://borgbackup.readthedocs.io/en/stable/changes.html
The only downside of borg is it can only target ssh host natively, but there are services like rsync.net (with special borg pricing), borgbase or you could locally run borg and rclone the entirety to anywhere you want.