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Right now I'm trying to decide between NU and UChicago. I'm leaning towards UChicago but I'm not sure if its worth 60k more in loans...

NU offered 150k, UChicago 90k.

gpa/lsat: 3.8x, 172.

I'm interested in doing something with international law, possibly public interest, but I'm pretty open. I have approximately 20k in savings, and the rest of my legal education will be financed by loans.

Any insights would be greatly appreciated!

You'll be asked for your total cost of attendance at both schools, I'd go ahead and add those to your OP.
I'm also interested in hearing you flesh out your goals a little bit. That is what really decides whether Chicago is worth the extra $$. If you don't have a more specific idea of what you want to do, you'll likely end up in Biglaw, which makes NU the right call here I think. Congrats on the great outcomes!

Go to Chicago since it has slightly better employment stats.

OBOB is right as usual here. Without knowing more about some specific goals that would make UChi the obvious choice, I'd save the money and head to NU.