Just to add to Clara's answer, as I imagine you're essentially looking to see if this is a good fit for you:
The analytics practices of MBB merge strategy with analytics. In doing so, they recruit (and train) two main types of people:
1) Those with strong analytics capabilities and an aptitude for commercial thinking (Maths majors, data scientists,etc.) AND train them to have a commercial mindset
2) Those with strong commercial thinking and an aptitude for analytics, AND train them in analytics (statistical thinking, R, Phython, etc.)
The promotion track is generally the same (just with different titles).
Also, note that these analytics practices within MBB are not viewed particularly highly in the data science world for robustness (as with strategy, the approach is very much 80/20). However, the benefits of having a dual analytics + strategy training in a world where businesses are ever more data-driven is obviously highly valuable/marketable.