What are the strong suits (or money makers) of the different Big 4/Big 3 firms?

Hi all,

I was curious as to what the strengths of each of the Big 4 + Accenture and Big 3 firms are? For example Accenture is typically regarded as a powerful player in the IT Services/outsourcing space. EY is known for its Risk services. For those who have been with different firms or have some knowledge about these things, what differentiates these firms?

Thanks!

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