Duke and Columbia have very different atmospheres....considering one is in a relatively small town in North Carolina and has a more vivid sports/frat scene while the other is in NYC and doesnt have too much of the traditional colelge sports scene.
depends on what you want
Duke and UNC are similar, Duke may seem more selective but UNC out of state is pretty darn selective especially since you'd be international
Colgate is a very good school but is very different from the rest. Colgate is a very small liberal arts school in the middle of nowhere, with a traditional sports/frat scene.
Northeastern is in Boston which is a FANTASTIC college town. during the school year about 1/5 people you meet in the city will be a college student, great young vibrant atmosphre. Northeastern is not as high ranking as UNC, Duke, or Columbia, and has a very different atmosphere. Being in a city it has an urban campus (not an enclosed one, like even Columbia) and its definied by the co-op system. This means that for a large amount of your time at Northeastern you'd be actually working, getting real job experience in real companies, making money, and this counts towards your grades/graduation. It's a different type of education that is very practical and preprofessional
again, depends on what you want