Both of the latter leave the client in basically the same position as the scam artist and none of the three should be performing testing. A large part of my business involves verifying other company's test results. These so called inspectors and testers give honest, hardworking professionals a bad name. Make sure the company is licensed in their municipality. Ask how many houses they have tested according to proper protocols.
Experience is more important than length of time in business.
E.D.I. was established in order to train and certify inspectors in order to raise the quality and consistency of EIFS inspections in the country. They are the only source of certified third party EIFS inspectors that has been approved by BOCA, which is one of the three code bodies in the United States. Construction knowledge is critical to making successful recommendations. Some companies refuse to testify in court. You may well need this service.