Well, Cpanel is very good, how ever it is very expensive compared to the rest, and i know DirectAdmin is quite good, so it all depends on what u gonna use it for, i.e. if its for hosting sites then cpanel, if its only for a few sites on a server or only ur site then u might use a cheap domain
my choice would be cpanel and ensim...plesk is so so.I would like to try the open source ones and to see how it is but haven't had a chance.Cpanel i think has more features,it being able to install more progs and stuff ....