It's a tossup only because we haven't yet seen how either man responds to being seriously hurt in the pro ranks, and both men pack a wallop. In terms of resume, Price is miles ahead. He's already almost cleaned out the domestic ranks, and looks to be steadily improving in every fight. Wilder on the other hand continues to tread water. At some point (perhaps it's already passed) he'll start getting into bad habits and believing his own hype. At his level it's not enough just to fight and get knockouts. You have to test yourself and learn from your experiences. Otherwise you risk stagnating and even regressing.
What gives you the impression this fight will ever happen? Wilder has a mid December date booked. Hopefully against a much better quality of opponent than he's been fighting thus far. Oscar was making some noise about Wilder fighting someone top 10. Hopefully that's what will happen.
The top 10 of the Arizona state retirement home maybe. I have Price winning purely on the difference in quality of opponents so far, I don't pay much attention to sparring rumors and I know Wilder has potential, but his record might as well be 0-0 0 KO's