Debian 3.1, but was not successful in getting X to work, but didn’t put a lot of effort into it. Then I got Mandrake running with X, but went back to Windows. On a small computer, I got FreeBSD running as a server but never used it, so that went away again. Knoppix a couple of times to recover data from failed Windows installations.
Yeah, it’s not until recently that I installed Debian 12 on a old work laptop and was very impressed. Now I’m on the fence of having a stable distribution or sumthin with newer packages. I love the philosophy of Debian and the wide usage on servers but Arch is personally also up my alley, however I have not used it at all.