Hi there!
Well, I got acception for both of them (NYU-Poly and Columbia) for PhD in Civil Engineering. But my situation is different cause I got a brazilian scholarship that will cover all the costs (tuitions, fees,...) and will give me a monthly stipend to live there during all my PhD program. So, I decided for Columbia!
Anyway, I understand your situation (in general, Columbia is a better school than NYU-Poly) but if you have to go for NYU-Poly, don't be afraid cause I know it's also a really good school and you will get some great opportunities from there too!
Does anyone know about Civil Engineering at Columbia and NYU-Poly? Is Columbia program much better than NYU-Poly?