I have a late 2012 mac mini with 2.5 ghz I5, 16 gb ram, and 256 ssd. It's currently running on Sierra 10.12.6. Which OS should I be running to get the most out of my mac mini. Without slowing it down.
Depends on what software you need to run. I have a similar model running as a file server and it’s on Mojave. If you need to run old 32 bit apps, go no higher than it. As a minimum you should be on High Sierra for APFS support. Catalina should probably run fine.
I'm running Big Sur on mine. It has an SSD inside and runs like a champ. Patching Big Sur to run on unsupported macs is pretty easy - just a case of following some instructions step by step.
Depends on what software you need to run. I have a similar model running as a file server and it’s on Mojave. If you need to run old 32 bit apps, go no higher than it. As a minimum you should be on High Sierra for APFS support. Catalina should probably run fine.
Mojave kicked ass on the macmini late 2012 with 10GB ram!
but
the bluetooth, wifi and air drop were dismal and annoying even running any OSX
in a non-metal furniture room, so away that went! (in mid 2019)