For advanced users it is best to know the details of the validation of each product and the locations and seasons where each product has the best performance. Additional information can be found here: http://onlinelibrary.wiley.com/doi/10.1002/2014JD022453/abstract
Please also refer to our page of validation maps: https://darktarget.gsfc.nasa.gov/validation/maps. It is suggested you use the links to the full sized maps on this page.
For less advanced users there is a merged dark target – deep blue product in Collection 6 (currently available for Aqua only). The name of the SDS is AOD_550_Dark_Target_Deep_Blue_Combined. Please see the answer to “What is the merged product?” for additional information.