Plesk and cPanel is pretty great them both, for hosting companies, the administration and management of cPanel is pretty simple and easy. But for the customers the security for your websites it pretty horrible.
Plesk offers security out of the box and is very secure when hosting multiple websites on one shared hosting. For hosting companies management and administration is not as simple as cPanel.
So when ordering your shared webhosting, determine if you will have only one website or many and how often you will have backup.
There is pros and cons with all kind of hosting offers, but loosing your data is the worst that can happen.