Right-handed players are better at moving, there is no doubt about it. Gartner is smoother, has access to more precise deking, and has a better shot than Modano and arguably Bure.
The gap between Gartner and Modano is much wider than the gap between Gartner and Klima, so why are you so concerned with Modano? It's clear as day that Klima and Gartner are levels above Modano.
And, to be extremely great, speed can't be higher than agility. Bure suffers from this problem.
Maybe Bure is better for those who are constantly turning around and skating back to their blue line in hopes of cheesing the game. That would make sense because he's faster.