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Did my undergrad in Econ (and a STEM double major) at NU. Tons of resources, clubs, and alumni to network with for consulting, big MBB feeder (for undergrads, not just MBAs). Less structured and somewhat weaker for banking as others have said, some BBs recruit on campus and others don't but usually the Chicago branches and to my knowledge often PWM or S&T rather than IBD.

With respect to the academic experience - NU Econ will be fairly theoretical, but there's a Business Institutions and Practices (aka BIP) minor that includes intro courses in accounting and corporate finance, so if you do that you'll at least get some basic training but would probably still have to self-study IB technicals far more than you would at a true undergrad b-school. Kellogg also offers undergrad certificate programs in Managerial Analytics (aka consulting track) and Financial Economics (aka finance track), if you really want to challenge yourself. These are pretty competitive to get into and offer a nice resume booster, although they will also force you to take harder classes and risk sacrificing a better GPA. Anecdotally, my friends who did these programs were the ones who had the best career outcomes among people I knew: Managerial Analytics people to MBB and Financial Economics people to EB M&A or BB equity research roles.

Location-wise, it's definitely harder to end up with a job on the East Coast right out of NU than it is at Cornell, all things being equal, so I would lean Cornell if you're set on working in Boston or NYC immediately after you graduate. Plenty of NU folks on the East Coast, but from my experience, many/most of them are in media, entertainment, or marketing rather than banking or consulting. Conversely, if you like Chicago and are OK living there, great, NU is your ticket to all kinds of cool opportunities in the Windy City (and other places in the Midwest, especially Minneapolis). And honestly, Chicago is way cheaper than NYC and still a world-class city - a great place to live it up as a recent grad/young professional.

Last point I'll make, and obviously biased here, is that the factors of being close to Chicago and having Big Ten sports (especially now that our football team is actually good) were huge positives for my overall college experience, on top of the standard social and academic experience that you'd expect to get from any comparably prestigious school (i.e. Cornell in this case). The flip side is that NU probably loses the prestige battle to Cornell, at least in terms of name recognition to the average person (your mailman, your grandma, etc.) - although I think the brand perception difference is nonexistent among people who will be interviewing you, and that's where it counts. That said, certainly frustrating from time to time correcting people who ask me how I liked going to college in Seattle or why I went to Northeastern instead of Boston College or whatever.