I've never heard of Plesk, but after researching it that product seems very close to CPanel. I've never tried it but I would rather stick with CPanel as I have used it for many years and have the most trust in it.
VirtualMin is a popular free and open-source control panel that warrants some consideration. Both cPanel and Plesk are capable control panels, but VirtualMin has been around for over a decade in one form or another, gets consistently updated, and gives you a massive amount of options when it comes to managing your server.
Due to the number of options it gives you, some find it a little overwhelming when comparing it to cPanel or Plesk, but once you get through the process of creating your first site on it, the rest seems fairly natural as it's all the same "flavor". It's worth trying at least.
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