I'm not a particularly big fan of the Tiger brand - his record is superb and he is a truly great player but I think he's too petulant too often when playing. If he learned to control his reactions (to his own shots) I think he would be a superb example.
Regarding the hardest working player it would be interesting to compare the practice regimes of Tiger in his late teens early 20's to that of Vijay now. Tiger still has the newlywed status whereas Vijay will be looking to get out of the house as often as possible!!

All adds to the mix of opinions........