I've been in public accounting most of the last 25 years, and for at least that long I've been hearing that audits are a commodity.
Paraphrasing Ron Baker of Verasage "If bottled water companies can differentiate themselves, why can’t auditors differentiate an audit?"
He's right. At the end of the day, water is water, yet there are how many different brands of water on the shelf.
And the audit is not a commodity either. Each CPA Firm approaches it differently. Find the one that works for you.