Malkin has a higher ceiling, Crosby is more consistent. Crosby's consistency typical beats out Malkin's Lemieux like flashes. This year may be differ
Malkin plays a flashier style, and is better at stringing the puck on a thread and making plays all over the ice. He also has a great slapshot.
Crosby is better down low and better at making plays down low around the net. He also has a by far better overall shot (except for slapshot), and a best in-the-history-of-the-NHL backhand.
Crosby is a faster skater. Malkin is a more deft skater. Crosby will beat you with speed. Malkin won't.
If you have a breakaway, I'd almost always rather have Crosby than Malkin.
If you have a PP, you almost always rather Malkin control it. He just creates space so well for other players around him.
So is Malkin Now the Penguins best player? Right now he is, but that can change on a dime
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Damned spoiled that we have both of them on the Penguins.