Update process

Hello,

I need to upgrade my good old CMP to something newer (13 or 15?) because 12 is out of system requirements for so many apps.

Now Monterey is installed on my main NVME drive and since this is my main Mac I can't afford to loose data or experiment and fool around for days :)

So I have a couple of questions:

13 or 15? Which one is the most stable today?

Which would be the best/safer process to update? I have Time Machine backups on a mechanical drive and I also have a spare SATA SSD if needed.

iATKOS | United Kingdom