They're all pretty weak unless you've gotta host people with minimal clue.
They do not offer me the control I desire.
On that note, cpanel code is a mess but probably the most useful from a user's perspective. Plesk is pretty solid, I have not touched it since 2.5 but they've done good things since -- I would reccomend Plesk. I have no experience with ensim. If you are a hosting company, you may want to look at H-Sphere (
www.psoft.net).
I did some time in the hosting industry, it probably took a few years off of my life.