So, we agree that this comes down to Predators or Terminators because OP didn't give the Xenos a numbers advantage for some reason.
Well it's in NY and if there are civvies then Xenos can increase their numbers. And if it looks like the xeno population will get out of control, the Preds will just nuke the city. Many people forget the Wrist Bomb is always part of their Standard Equipment. Preds are the only ones with the tools and skills to get the job done.