Answer: None of the two.
Better you take the money and invest it in expanding your network and buy Investment Bankers drink/dinner every now and then and cultivate a strong relationship while demonstrating your ability, willingness and eagerness to enter investment banking sector. That will give you a chance of being selected as an intern which is a ticket towards an investment banking career.

Always remember: people will be more inclined to hire others they know and trust. Dosen't matter what qualifications you hold (although basic ones need to be there). You have to be in the right "camp" with the right people.

Otherwise you are one of thousands of other applicants who flood the in-tray of Ibankers with their resume.