MBB in developing country(post MBA role) or M7 MBA?

If you had been invited to case interview to a MBB in your home developing country and at the same you were preparing for M7 MBA applications, which would you choose to focus on?

I'm currently UK based working at Unilever. I'm a young manager who has rised fast through the ranks but always wanted to do consulting.

Options:

1. MBB post MBA role in Brazil

2. Apply to M7 MBA aiming MBB in the US

My goal is for a long term career in MBB in the UK or US. Plan B would be a pivot to Big Tech also in either US or UK.

I've already tried applying as EH in MBB UK but not invited to interview.

Thank you