I will speak from a new growers experience here, but I started my plants in regular old Miracle Grow soil. Garden if I am not mistaken. I decided to switch to Fox Farm about 2 weeks in and am very surprised by the results.
See that Miracle Grow stuff is a general growing medium, meaning it will support most plants. The Fox Farm is a specialty soil. And dont forget the age old adage, you get what you pay for. My two cents, for what its worth, is to not use Miracle Grow soil, period.