TAS vs. PE DD vs. Fin Advisory vs. Deals Adivsory

I'm interested in both finance and strategy, so I'm trying to get a better understanding of the niche roles within the Big Four and MBB firms. I've looked into non-CPA Transaction Advisory Service, Financial Advisory, Private Equity Due Diligence and Deals Advisory. I've done some reading, but if anyone currently in these roles could speak on the type of projects they worked on and how it compares or contrasts from the others, that would help a lot.