I read your post, but I still think you’re lost. What is your goal? Do you know? To make a lot of money? In that case, I recommend banking. And Emory because I’m worried CMU might be too rigorous. Although I dont think you have a great shot at being a GS banker from emory - but It sometimes happens.
Banking is very much related to high gpa and pedigree of school. Major doesn’t matter much- you won’t see as many math majors with high gpas in banking because there are much easier majors to get that gpa and you will be penalized if your gpa isn’t high.
And the people who can get the high gpas as math majors don’t waste their time in banking.
Not that being a math major will hurt you as a banker, you might be shooting yourself in the foot.
I think quantitative backgrounds are extremely good to have for pretty much anything other than banking.