Add one more for cPanel..
I only have experience with one other CP, Plesk, it's a good interface, but when I went to their support forum ... it had nothing compared to cPanel so I ended up finding my own answers.

Support is so important .... even with web host users. The cPanel forum is full of problems .......... hehe ..... and answers. We don't have a large enough business to worry about having to offer other CP's to our members, so for now it's cPanel. I'm hoping that will change