Sharon,

So far I not noticed any significant difference from three different soil.

But one thing for sure is that beds with native red soil heavily amended with compost is doing much better than those three ready mixes.

I can tell exact results at the end of one harvest season. I also found that one of my friend bought garden ready mix from Bob Cunningham, www.okcdirt.com. That looks nice to me but, I not yet tested that soil in my garden.

Regards -Chandra