Hello. Duke student here. Thought I'd post a list of firms interviewing for their Chicago offices at OCI this year for Duke. Definitely a smaller number of firms from Chicago than from, say, New York or DC. You might want to compare with Chicago firms from Northwestern to see if there is a big enough difference to alter your choice.
Bryan Cave, LLP
Edwards Wildman Palmer LLP
faegre baker daniels llp
Foley & Lardner, LLP
Holland & Knight, LLP
Jones Day
Latham & Watkins LLP
paul hastings llp
Perkins Coie, LLP
Ropes & Gray, LLP
sidley austin llp
While there are probably fewer Chicago firms directly interviewing at Duke, you will likely have significantly less competition from students within the school. The number of students here specifically targeting Chicago is considerably lower than for a number of other markets. With your ties, you would be in good shape. As well, Duke does an On Tour Interviewing Program in Chicago, IL early in August, which allows students to meet with interviewers from a number of Chicago firms that don't come directly on campus for interviews.
Additionally, as a similarly aged student here at Duke (28 years old, rising 2L), and moving from a similarly large city (New York), I have found Durham to be a fine place to spend three years of study. Cheaper cost of living when living off of student loans is highly underrated.
Feel free to PM me if you have any questions in making your decision.