Big 4 vs. Graduate Leadership Program prior to i-banking

I just finished interning at a Big 4 firm this past summer, spending half my time in Audit and the other half in Financial Advisory; corporate finance (mid-market M&A). Didn't really like Audit but really enjoyed CF. Unfortunately, I would have to spend 2-3 years in Audit full-time before I can make the switch back to corporate finance (not guaranteed).

I tried going through full-time investment banking recruitment but was unsuccessful. Ended up applying for a bunch of other random jobs and got an offer from the Walmart Finance and Accounting Development Program, specifically in the Finance stream.

My goal is to transition to i-banking or consulting after 2-4 years. Potentially looking into doing an MBA as well. Does anyone have any suggestions with regards to whether Walmart or Big 4 would be a better route?

Thanks!