Sorry I'm not more help here but I really don't know much about the different soils myself; pretty much only what I've been told by the pros.
Weedhound Reviewed by Weedhound on . 50/50 Spagnum Peat Moss and Vermiculite 50/50 Spagnum Peat Moss and Vermiculite is the soil mix I have been using. Germinated seeds in 1/2 gallon pots, been under six 23 watt CFLs for a total of a little over 10,000 Lumens. Running 19 hours a day. Have a nice little fan in cab. Cab is l-12inches by w-12 inches by h-40 inches 4 of the CFLs are the regular yellow and 2 are Daylight. They get about 15 oz (just enough to make water come out holes in bottom) pure, Brita filtered water with a few drops of Superthrive in it Rating: 5