pgbackrest was always easy to use in my experience. Not very hard to setup or configure, and low overhead. Supports spool directories for WAL shipping, compression, and block incremental backups (YAY!!!). I ran my last company on it for the last ~6 years I was there. Never any complaints, solid software (which is what you want for backups).

I have been using barman indirectly through CloundNativePG with my latest company, but don't have the operational experience to speak on it yet.