The 1 school is Chicago, not Northwestern, though the latter arguably has a stronger alumni network because it feeds almost entirely back into Chicago. Still, Chicago Law dominates Chicago in the same way that Harvard dominates Boston and UVa dominates DC.
If you're interested in hearsay, DePaul has a strong network in the suburbs. My good friend from there told me that, when she applied to schools, she got the sense that DePaul has the right combination of alumni network and name recognition for decent placement.
Honestly, I don't think you should split hairs. I would be more focused on scholarship money.