There is no difference, neither one should be rubber stamping. But the fact athat this question is being asked, that we recognize a fee appraise can fear being blacklisted or staff appraiser worried about losing their job if they don;t hit value/rubber stamp shows that the AMC conflict of interest is a fail as a third party fire wall (as is allowing lenders or AMC;s to use staff appraisers)
While some ethical companies do not abuse that leverage, many will, and it is the implied threat itself that is the problem. The regulators did not want true appraiser independence from this threat, or they would have designed a different system
IF either staff or fee appaiser is okay with a desktop do it, but staff are employees and more often in the position of having to do forms or products from their employers...imo.