The macOS version that most impressed you

[maflynn]

Do you mean Mac OS X 10.0

Yes

 

[Bungaree.Chubbins]

It would have been 10.2, the first OS X I ever used. Newer versions were incremental improvements from there, but 10.2 was leaps and bounds ahead of Windows XP.

I had a similar experience. I got a secondhand G4 Mac Pro to see what all the fuss about Macs that I was hearing was about. I didn’t even look at OS 9, and put OS X on it. 10.2 was what I got hold of, and it converted me away from XP.