I would suggest going to each college for a visit, if at all possible, even if you have visited before. Many colleges offer an 'admitted students' weekend, where you have an opportunity to sit in on a class or two, stay in the dorms, and so on. By experiencing both colleges once more, in close proximity, time-wise, your better fit may emerge.
Have you compared each school on a series of elements that are most important to you, e.g. course offerings in your major, class size, internship opportunities, clubs, recreational facilities, dorms, study abroad opportunities? If so, and you're
still have trouble making the decision between two similar schools, you're likely to be happy at either one. Perhaps, at that point, you might want to look at the financial aid offers again and see whether one is the better "deal" financially.