Best OS on iMac 14,1

I've a 21,5" iMac from late 2013, with a CPU 2,7 GHz Intel Core i5 quad-core, a GPU Intel Iris Pro 1536 MB and upgraded to 16 GB 1600 MHz DDR3 of RAM and to a 1TB SATA III SSD. It currently runs Catalina, which OS, installed using the OpenCore Legacy Patcher, would work best without problems of any kind?

submitted by /u/No_Calligrapher_3651
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