I hope we could both equally concur this sentence is Improper since "superior" is really an adjective, and can't be the topic of "is". A similar is correct any time you place "the best" in that location. It's easy to argue that "the best" may be suitable as the topic https://constitutionlawindhakarac31594.pages10.com/detailed-notes-on-lawyer-in-dha-karachi-71806766