Web Host Manager or WHM is the manage interface provided to Reseller which enable you to setup new account, modify/upgrade/downgrade packages, suspend/terminate existing account and do many other daily routine hosting activity with ease. WHM control panel can be access by Reseller on port 2087 with https.
Cpanel is the control panel for end customer which will be provided to them by you – as reseller for their web hosting account management. Cpanel can be accessed by customer on port 2083 with https.
PLESK – The most widely used hosting control panel on Windows and we love that too. It makes working with Windows OS lots easier. You too as Reseller get your Plesk control panel access which enables you to manage features for your customers. Plesk run on port 8443 at https.