This speed advantage that Ross has also means he has a greater ability to drive to the hoop. This leads to the second way in which Ross is better than Daye: dunking. A dunk may be only worth 2 points on the stat sheet, but the psychological effect it can have on a game is massive. It gets the team hyped up, the home fans roaring, or if we're away, it gets the the crowd rattled up. It can be a huge momentum swing. In the right situation, it can change the flow, maybe even the outcome of the game. Ross is the reigning NBA dunk champ. Meanwhile, it's not everyday that we see an Austin Daye poster. He would never be able to bring that kind of impact on a game. Not a knock on his play, he just doesn't possess that flair that Ross does. Unlike him, Daye is just not "highlight material." He is not a player that most people get excited to see.
Ross has not used his athleticism to full potential yet, however. His FTs attempted per game averages are painfully low, as he has a tendency to get passive and hesitate from slashing inside. Stats say that Daye is better in this regard at this moment(drawing fouls).
So it comes down to Ross being better at the athletic and intangible aspects at the game, while Daye excels at basically everything else (stats say so, at least). My point here is that Daye MAY be a better player than Ross, but not at ALL aspects of the game, as Xixak suggests.