Arsene Wenger is the best manager Arsenal ever had . Sir Alex Ferguson is the best football manager ever .

His 10 premiere league titles are amazing and spread over 3 generations . this feat perhaps , will never ever be beaten again.

forget about championship tournament like euro 2008 as there are only 1 off tournament over 6 or 7 matches .
even those manager who succeeded in this , when they crossover to the league , most fail