Now you see, there isn't one be all end all stat to throw all your points into. Although it would be very handy if you're going to be playing more ice time than normal for someone just entering the league (See rebuilding teams) to throw at least some points into your STAMINA, that's right, who would've thought that needing to be able to skate longer you would need stamina. Other than a healthy balance of all stats, you should build stamina.

Although again this only applies if you're going to be playing more minutes than others, otherwise I would suggest Shooting Accuracy for forwards, or Shot Blocking if you're on a rebuilding team as a D-Man.