I havent used plesk. Only used a custom control panel my programmer made in 2001 and then dropped that when he left the company and went with Helm and used that ever since.
Personally, I don't care for Plesk. It could just be my learning curve on it, but I spend infinitely more time on CPanel systems which seem to be more powerful. Then again, it could just be my taste. Plesk seems to require many more clicks to get where I'm going.
Cpanel more powerfull, Forget it. Its making a server less powerfull. Keep that in Mind. Its using too much resources and plesk not. I use plesk and will use it for the next 10000 years. In plesk we can switch things off.
i used cpanel and plesk and i prefer cpanel cause it loads faster and its much easier for me to use cpanel
For windows my choice is definitely HELM. Plesk has been taking to much resources on mu machines and I have had more trouble with it.