That’s because on 9/11, Republicans were in charge: G.W. Bush, Rudy Giuliani, George Pataki, and Donald DiFrancesco.
In terms of evacuation, or even rebuilding efforts, you can’t really compare this to 9/11. As devastating as 9/11 was, the destruction in NYC was concentrated in a relatively small, concentrated area of lower Manhattan. Sandy’s destruction hit all five boroughs, including relatively isolated areas (as isolated as they can be in NYC) like the Rockaways. And that’s just NYC - if anything, jersey Jersey and Long Island were hit harder. It’s a much, much bigger area to evacuate, and a much, much bigger area to rebuild (and note that the area destroyed on 9/11 is still being rebuilt to this day.
The other major difference in terms of the recovery effort is that the area destroyed on 9/11 was largely a commercial/business area. Relatively few homes were destroyed. Here, obviously, many homes were destroyed. To the extent there are delays in the recovery effort (as there are always are), those delays are not nearly as visible when they affect a commercial district than when they affect residential areas.