Do you like or would like to play games like The Last of Us, BloodBorne, God of War, NIOH or other exclusive games?
If you answer is yes, then IMO you should get one and if you have or wanna get a 4K TV, get a PS4 PRO
If your answer is no, keep the money and upgrade your current PC!
IMO that's the only advantage of Consoles over PCs, their exclusives. As anything related to performance while gaming a decent PC can do much better than a console.