The second is OneDrive - Personal (which you'll see shows up in Windows File Explorer, as well). This refers to a personal OneDrive account--NOT one associated with ESU. For example, if you have an outook.com or hotmail.com email address for personal use, you could add it here and sync your files. In most cases, you likely will never need or want to do this and can safely ignore it.
Finally, if you have the older OneDrive for Business client installed on your PC, you do not want to use this one. Only use the client simply called "OneDrive".