I've never used Solaris or illumos before, but I'm looking for something bullet-proof, idiot-proof and maintenance-free. The mainstream solution would probably be Proxmox and while I know how to administrate a Debian system, I don't trust myself as a sysadmin while acting in a personal capacity. Proxmox intrinsically just doesn't bring the peace of mind that I won't accidentally blow it up while away from my apartment.
Just because a solution isn't mainstream doesn't mean it's not worth taking a look at. Even if you don't end up selecting them, it brings a healthy perspective that you wouldn't have otherwise.