The Pro is geared towards HDR and 4K. If you are not planning to upgrade to 4K in the foreseeable future, you would be wasting money on a Pro. Now the last I heard about the Pro on 1080p is that it can run some games faster. I have not seen an actual review of any comparing them side by side.
But the bottom line is the PS 4.5 (Pro) can't play 4K movies and doesn't have the capability to play games at actual 4K resolution (it upscales games to "near" 4K). IMO it's not worth the extra $100. That's two more PS4 games or money towards a racing wheel and pedals.