Well from a customer viewpoint, this is how i would list the Control Panels
CPanel
Plesk
Ensim (Ugh)
From a hosting standpoint, i wouldn't alter that. CPanel is not only easy for you to use, but your customers will love it. We have found that alot of customers do prefer CPanel over Plesk or Ensim, and that alot would even pay that little bit more for a CPanel plan than an Ensim or Plesk plan.
Don't get me wrong they are all good panel's, but if you want customers, they seem to come more towards CPanel. Make sure that when you do open your host that you
a) Offer more than 1 method of support, Forum Support, Trouble Ticket, and Instant Messaging/IRC/Live 1 on 1 is a great start for any host.
b) Have a nicely designed, and easy to navigate site, you won't get any customers if they cannot find the plans
.
c) Try to get a few staff members from different timezones, that way you can answer most customer questions within a quick timeframe.
d) Check your site over for spelling mistakes, and grammatical errors, you want your site to look professional. Remember first impressions really, really do last.
That is pretty much all the advice i can give
.