I can find faults in any of them, but mostly hate working with Redhat/CentOS/Fedora. Strongly prefer Debian over Ubuntu, and I strongly prefer Gentoo over Arch. SUSE is an unknown, not sure about that one.
I have a bit of a fear of SLES, purely due to Puredisk using them as their base back in the day (before they were swallowed by Symantec/Veritas/Broadcom/whatever). The amount of time I spent in YaST2 and losing data, again and again, made me genuinely never want to investigate any issues.
In highschool, I got a desktop from a yard sale (Pentium I) and got an HDD from goodwill, all for $10, just to install FreeBSD. It was awesome. I think I still have the desktop somewhere in storage.