Where to join Big 4 or Research Firm

Hello all.

I need guidance from you all. I am Chartered Accountant + CFA level 2 appeared candidate. I am at the beginning of my career. I have an offer in Statutory Audit from two Big 4 Firms. Plus I also have an offer from an investment research firm in their valuations (transaction advisory). I want a global career in investment banking. Where should I join?

  1. Joining Big 4 because of their brand and a very good launch pad. Work for 2 years and make a good exit

  2. Direcltly join a not so well known research firm in a profile which is interesting because it deals into valuations.