My Dad used to say, about former NYC Mayors, that it was a dead-end job .. and that seems to hold true to this day. No Mayor of NYC has ever advanced past that position. Even Mario Cuomo, who ran for Mayor but lost, went on to become Governor ... had he won the Mayorship then he probably wouldn't have ever become Governor or even entertained a run for Prez.
Oh well .... /babbling nonesense mode off :)
NYC has a larger population, than 39 states in the US — so the responsibility of the Mayor of NYC is larger, than that of governors of 39 states.