Always a tricky one to answer Pete! FWIW Logic 10.6.0 seems fine here on two Macs, an ancient Mac Pro 5.1 patched and running OS 10.15.5, and a new 16" Mac Book Pro Running OS 10.15.7. The bug fix list is pretty long and worth checking out. If you are considering going to Big Sur, well, Logic should work well on it, but given that it is so new, I would suggest taking the time to check any and all of your 3rd party Apps - especially Plug-ins-for compatibility. I have received quite a number of Mails from various AU developers advising that their products are not yet ready for Big Sur.
The safe way would be to clone your current drive to a second one, and update that to Big Sur in order to test without "burning your bridges". I've been doing that with that old Mac Pro for quite a few years.
kind regards
Mark