If you're using Linode, the ServerPilot control panel makes it easy to run PHP applications on your server with a very fast web application stack configuration.
ServerPilot doesn't replace Linode's control panel. Instead, ServerPilot provides the website management functionality that's missing from Linode's control panel. ServerPilot is a hosting control panel whereas Linode has a VPS control panel.
If you're a Linode user, the Linode control panel is where you would create new servers and manage DNS for your domains. The ServerPilot control panel is where you configure PHP websites and MySQL databases.