The guys doing this stuff now are like the early resin casters, figuring out the best methods and materials by trial and error. Each is probably using what worked for someone else, or maybe the best resin for the printer they use, or maybe the cheapest, or maybe the one that gets them to a finished part faster. Once it is "scienced out", the majority of print guys will all be using the same (best) resin for whatever they are doing.
--Mark