The largest benefit of a larger auditor, IMO, is the reduction in risk of "collusion" between the auditor and the client company. They also tend to have more personnel-per-client than small firms who are often overbooked.
Keep in mind too, the more clients a large auditor has the higher the chance that ONE of them will "slip by" regardless of how careful the company is. So finding cases where a large auditor failed really means less given the huge number of clients they have.
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