CalTech is a cut above the others, clearly. But it doesn’t sound like it’s the right fit.
GTech will be a compromise between Michigan and Caltech (better weather than Michigan, very intense academics, some parties but not crazy about parties and football).
Atlanta’s crime rate doesn’t affect GTech’s campus.
Michigan has Ann Arbor (top college town) and a more diverse profile (better gender ratio on campus/GTech has mixers with Agnes Scott but still…; better mix of majors and perspectives).