Solaris kinda-fanboi reporting in. I dabbled in Linux in my earlier days. Did some VAX/VMS. Got thrown to Solaris around 2.4 and have not looked back since. I rather enjoy it, though its future is a little hazy under Oracle. Back when Solaris 8 was still the big thing, and Solaris 9 dropped x86 support (no, wait, we were only joking,) Sun released Gnome and KDE packages. I installed both and far preferred Gnome over KDE. Anything over the CDE built in, even with its nostalgia value.
I had been exclusively command line in Solaris 10, though I did a recent VirtualBox installation of 10 with the Gnome desktop. Still seems pretty sharp to me.
I had Solaris x86 installed years back. The x86 version had not been out very long, and it took an effort to get it running. I eventually abandoned Solaris x86 for BeOS. Not the same class, but I liked BeOS. Then Be went under; pitty.
I used OpenSuse Linux for quite some after BeOS and after abandoning Fedora. I still prefer OpenSuse more than other Linux distros. A company I worked for used OpenSuse in production for data processing. It ran alongside AIX and HP UX. Cheaper, too.
I thought about giving OpenSolaris a try, but I haven't yet. Recently bought a used Mac mini with Apple Unix, so now we are giving it a test drive. My "Apple honeymoon" is over since I discovered it doesn't multitask as well as I expected. I was ripping one of my music CDs and the multitasking slowed down more than I expected.