3.1 on the A1200/030 (GVP 030 series II) - my retro machine
3.9 on the A4000/060 (which sadly STILL needs the CSMKII repaired, so it's put away right now.)
3.1 on my mostly ignored WinUAE HD image (haven't really used it for much at all.)
AROS on an older PC in the corner (nice OS, I just don't know what to do with it, either.)
My day to day computing is all Windows or Linux (which reminds me, I really should try out Feisty Fawn, already.)