Originally Posted by Unregistered

In terms of number of clientele,
Tax: KPMG > Ey = Pwc > Deloitte
Audit: Ey > Pwc = KPMG > Deloitte
Risk advisory: KPMG > ey=pwc=deloitte

Industry plays a big role too, for eg
Ey audit is better for tmt, pwc audit better for financial services