A comparison of different bagged soils is always entertaining, but with all the variables like strains, lights, nutes it is hard to learn much from such a comparison. It looks like the standard is around 5 gallons of soil under 1000 watts of HPS and the different additives give different results, so a nice way to view your options is by first deciding what you want, a huge yield, pungent aroma, dense buds, hash material, oil...
The TGA Super Soil worked great for me, but cost over double what the others go for, as it has lots of stuff in it and is simply an easier way to get a mix of the SS that is popular with many growers already.
If you want to have a contest, there needs to be a prize.