NYC Mesh is a great initiative, and probably the one with the most "modern" setup as it's the newest one. But take into consideration that it might also not be as reliable or work at the same scale as Freifunk or Guifi.
Not sure if these numbers are the best to go by. Freifunk surely has the most setups. I might be completely wrong on this but I think most Freifunk installations are isolated, i.e. single-node with e.g. the local DSL as upstream. I wonder which of these have nodes with no cable-bound upstream or at least actually used interconnects with other nodes.