Dhoni captained India in 45 Test matches : won 22, lost 12 and drawn 11 to have a total win percentage of 48.88.
Ganguly captained India in 49 matches: 21 wins, 13 losses and 15 draws to have a winning percentage of 42.85.
Dhoni - T20 World Cup win in 2007 and the ICC ODI World Cup win in 2011
Ganguly - no world cups
nothing more to say...