With Edsicovery you will also get everything in the hidden recoverable folders, so its more than what you would get if simply exporting to a pst from Outlook.
You can choose not to export those out to a pst however.
https://learn.microsoft.com/en-us/exchange/security-and-compliance/recoverable-items-folder/recoverable-items-folder
I would think the pst export option from Outlook is the way to go, but either will work.