full disclosure: I attended Booth (R3 applicant) and did not apply to CBS.
I think both schools will give you great opportunities in IB. Booth has great placement (including in NY) and a first rate reputation to boot, too. Virtually anyone in my class who recruited for IB (and was serious about it) got a job. So the opportunities are as good as anywhere and it mostly comes down to your doing your part during the recruiting process.
I would add that business school is a lot more than just your first job - it's a personal journey, a learning experience, a network, and an investment in your future. Considering these might help you make a decision. And one of the best way to get a sense of how much you'd get out of each school is to talk to current students or alumni (and visit both school if you haven't done so). They were in your shoes not so long ago and will give you a real sense of what it's like to attend either school.