Arkansas fans have made many mini-Cam comparisons for Pryor. Their height, build, athleticism, skillset and improvisation skills are very similar.
Cameron is a very tough, physical runner, where Pryor is a bit softer and protects himself against contact. He will occasionally lower his shoulder and always brings a wicked stiff arm and very tough body to tackle, but their running styles in traffic are very different.
Pryor also came to Ohio State to become a complete, NFL quarterback. He could've gone to Oregon or Michigan and put up outrageous yards like those two dynamic QBs, but he wanted to become a well rounded QB, knowing that was his only sure ticket to being drafted at QB. He arrived as raw as any QB prospect in america, and is still taking two steps forward, one step back on his path to becoming a well-rounded QB. That path has taken longer than many impulsive fans and media types have hoped, but the progress has been noticeable.
There are good and bad sides to this. The bad side is that he is sometimes reluctant to run, often looking to buy time for a pass and keeping his eyes downfield. Where Cam, Denard or Darron would make 1 maybe 2 reads and bolt, he is often scanning for more targets. He has improved in this area as much as his passing, but he will still have a few times where he lingers a bit too long when he needs to tuck it and go.
One very nice wrinkle he has added more prominently in the past few weeks is the Denard style playaction pass, where he takes off upfield in a pseudo scramble but throws at the last second to a target down the seam. This has made life more difficult on opposing defenses.
Newton is a more decisive runner & passer, but Pryor is a more accurate passer, imo.