What are your post MBA goals? (Job? Industry? Location?)
How will you be financing your degree? (Debt? Savings? Sponsored?)
Do you *have* to choose between these two programs? Why not wait a year?
Unless your answers to the above questions very specifically direct you to Marshall (e.g. you only want to work in
consulting, in
LA, at a
non-MBB firm, and your degree will
not be funded by loans), then I would definitely follow the money to BU (as socalmbahopeful also suggested).
You should also consider if waiting another year is the best option. Depending on your goals, maybe a different program altogether would be better for you. Your stats suggest you have a fighting chance of being considered for admission just about anywhere.
Good luck!