Great as long as it's easy to maintain ratio. And by "easy" I mean basically not having to do anything that can't be automated. I also don't care enough about the harder-to-get-in trackers that I would spend a lot of time sending in screenshots of profiles of other trackers I'm on or whatever. I'm not trying to get internet points for being on the very "coolest" private trackers.

The good thing is that decent private trackers have a well maintained catalog and most content usually has at least one or two seeders even months/years after the torrent was created, and these seeders often have a ton of bandwidth.

In contrast, public trackers often falsely advertise the amount of peers in the swarm (so a torrent that's supposedly alive is often dead). I'd say I'm grabbing about 80/20 from private/public trackers, and I seed each torrent for around 30 days. Public torrents are often so starved for somewhat decent seeders that I regularly have a ratio of 20+ after the 30 days I'm seeding for. And that's without a seedbox, just a normal Internet connection.

In the end, both are fine. When you setup your *arr tools correctly, they usually choose a decent release automatically, whether from private or public trackers.