What OS should I get for iMac 21.5 2011

I have somehow successfully upgraded the iMac and now it has the following specs: I7 2600s K2100M 10GB Ram 500 SSD What OS would be the most stable and work without breaking any time soon? This Mac will go to a family member who isn’t tech savvy, so if anything crashes I will have to come and fix it. I was thinking about Sonoma, however as of now I am not 100% sure it’s the right decision.

submitted by /u/ketinng
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