Well, we're a H-Sphere host, always have been and wouldn't change. Personally I have used cPanel in the past and it's ok at best. H-Sphere comes with everything needed. there's no need to get cPanel, then have to get all the addons, like billing, helpdesk, etc., etc., etc. H-Sphere has everything built in. Plus it's made to work on clusters.
If you want more information or even a demo, go to H-Sphere's site:
http://www.psoft.net/. You can also view plenty of flash demo's around if you'd like.