Big 4 Audit VS BB BO

Would really appreciate any advice on how to choose between these 2 options:

1): Big 4 Audit

2): BB back office role (not internal audit)

They are both entry-level role. Comparing to salaries, I'm thinking more of the long-term opportunities. I hope to work in the finance industry at the MO/FO of an investment bank (not necessarily IBD). I'm wondering which of these options would be more of help in terms of my planned career path.

Thank you everyone in advance.