Logic of Login handling for UserRoles

Im now having 3 different user Roles but they need another Gui. Should I use one login.php for all or use a login dedicated to each global user roles? I dont mean Admin, Moderator and User. I mean User can be either a: seller or a bidder. That would describe my project more. Maybe to make a switch after getting the user role and send him to the proper „Dashboard“?

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