I only use OpenDNS. It's not parental control per se, but it can serve that purpose. It would probably be best to couple it with another software package.
I recognize those names, but I don't use them myself. I tried a free filter for awhile but I can't remember what the name was. It worked, but it was a little too aggressive, and ruined the web imo. Development ended on it, so the name isn't even important. Anyway, that's why I like OpenDNS. I'd be concerned that any of the packages would filter too hard, and not have good controls.
Check out both of the ones you mentioned. If there's still active development, they'd probably be the way to go.