Sir Alex indeed is the best manager in the world because he is a complete package.He is perfect in every aspects including club business management,talent production, frugal spending ,tactics and much more.
Currently he is the one who has won more trophies than any other manager in the world.Lets see the count
1 Sir Alex Ferguson (48 trophies)
2 Jose Mourinho (19 trophies)
3 Carlo Ancelotti (16 trophies)
4 Pep Guardiola (14 trophies)
5 Arsene Wenger (7 trophies)