How do I know which mold agent is best?
First, read through the EPA site on mold.  

If you look carefully, you will not find an EPA recommended product.  

Spores can be removed with detergent and water.  Spores can be killed with bleach and other disinfectants (biocides), but the EPA says:


  The use of a chemical or biocide that kills organisms such as mold (chlorine bleach, for example) is 
  not recommended as a routine practice during mold cleanup.


More importantly, is the source of moisture under control?  Have all wet areas been exposed and dried out.

Once the interior framing is dried out to 10 to 12%, (consider buying a non-contact moisture meter and insist the framing be dried out before continuing), you can spray seal your framing with a primer to encapsulate any remaining spores and close the walls.