I think CPanel is great, so have no desire to move to anything else. WHM is very handy, too. An advantage of using these is that many hosts have them, making it easier to move hosts if you need to.
I have been using CPanel ever since I got hooked. The functionality is great and the best part is that there is a huge community that develops add-ons and themes for it.
WHM/cPanel is best control panel for website owners, resellers, system admins to manage the websites as well as for server administration. Basically it is more user friendly and stable software.