I recently upgraded a Macbook Pro 2012 13" to High Sierra. Works quite well (already had 16GB of ram) and even recently got a security update late last year. I

I recently upgraded a Macbook Pro 2012 13" to High Sierra. Works quite well (already had 16GB of ram) and even recently got a security update late last year. I avoided newer OSs as there were complaints about UI performance and stuttering from my research.