Cooper is more accurate than Dak. But, his best attribute is his ability to process quickly and get rid of the ball. That helps the OL by not forcing them to sustain their blocks for longer than 3 secs, and by not having to resort to holding as much to sustain those blocks. He also doesn't run as many RPO's which require the OL to "hold their water" before getting downfield in case the QB pulls the ball and decides to pass.

Now, if they could just clean up their pre-snap penalties.