Sorry but the way your question is presented you appear to be asking for a comparison between apples and oranges...figuratively speaking of course.
I have tried many peat based mediums and I have noticed one thng that makes the difference in performance and that is the consistency of your growing medium with the ratio of base mix to the added compost, bloodmeal, bonemeal, dolomite lime, oystershell, greensand, etc.
I have done a side by side comparison with promix where I added only 25% more compost above what I normally mix on one occasion and on another, I added 25% less. The original mix that I used outperformed the higher and lower amended mix. I also did this comparison with my vegetables and flowers in my home and garden and not just MJ and the results were consistent all across the board. The only difference in the soil was one was bit more dense and the other was a bit less dense and yet a visible difference in growth rate and vigor could be seen.
My experience is only anecdotal but was a result of close observation none the less.