I think there is an unfair perception that Vettori's bowling is not that great. As I understand it, the problem for Vettori has been that his back has not been able to keep up with the stresses of bowling long spells in test cricket. This is a serious set back considering that spin bowlers are considerably less injury prone than fast bowlers. Ultimately, Panesar may end up with a better career record if he continues to play and improve as he has been doing, however, I think it unlikely that Panesar will ever reach the peaks of performance that Vettori has managed in the past; and only very hard work and determination will allow Panesar to even come close to Vettori's batting and fielding skills.