BB Corporate Banking - FT vs. MM IB - Internship

Hi There
I have recently graduated and now have two offers. One is a FT offer for the midcap corporate banking team of a BB. The other is an internship at a MM IB boutique (a tier below Jefferies). Even though I would prefer to do M&A, I am really not sure if I should take it over a FT offer of a BB. In the first few months I would work more but earn less. Additionally, as the MM boutique office is rather small I'm worried of not having the opportunity of staying FT after, especially in light of the current economic situation. I must say though, that because it is not the large cap corporate banking team the employee profiles are weaker than at the IB boutique. As I dont have a target-background, I'm worried though that this would be my only opportunity at M&A. At the same time, I am not sure if I would get the opportunity again of working at a BB if not receiving a FT offer at the boutique.
I am slightly tending towards the M&A opportunity but am really torn between these two options. What would you do in my situation? Would the corporate banking gig also provide good exits to F500 corporate finance or development in case I would later want to exit?