Restic doesn't implement compression and most probably never will (since compression when combined with encryption has been known to make the encryption "weaker").

Borg's "encryption" doesn't instill confidence in me.

Restic ships as a static binary so you can shove the version you used to create the backup and will be able to restore it forever (assuming we still run x64 machines).

Borg requires a server side component so cannot natively backup to cloud object stores. Restic can.

Borg OTOH is very lean and doesn't take a lot of RAM compared to Restic.

You cannot go wrong with either. I tried both and found Restic much easier to run and manage and the memory usage wasn't an issue for me (~4TB backups).