Wing is easier, you don't have as much defensive responsibilities, though a good two way winger or a player that can play both is valuable. Speed often determines if a player can play wing.. Casey has that... and from what I have read is willing to go into the corners... we will see on the next level but the kid looks solid, just needs to build his strength. I have played both, not at anywhere near this level and find center much tougher mentally. He appears to have both skills and can score... good pick imo.