Hey,
Unfortunately you're not going to find much regarding this topic. The amount of study that has to be performed to get this answer is neverending, in my opinion.
What I can say, plants require 11-some-odd elements to manufacture the sugars they need to grow and, in our case, creat cannabinoids and terpenes. How you chose to deliver those elements, realistically, shouldnt affect the final product. Plants have adapted to soil, getting everything they need through extremely complex chemical processes.
You can beat nature, in my opinion, but the conditions have to be right for the given strain.
I dont personally see a difference between soil and hydro, as long as the needs are met.
Hope this helps,