Early Mandriva with KDE 3.4 or 3.5 I think, but I can barely remember anything with clarity. It couldn't have been bad though, since I haven't used Windows on my own devices since 😉.

From my foggy memory, I think it was good for my then nocoder self, easy to use, stable, relatively lite, and had good looks.

I missed the Mandrake and pre-Fedora Red Hat era, but not by much.