This is a very popular and controversal topic and you'll find lots of threads on it.
The answer is "all three" ..... scratch, mix and doctored mix.
And not just folks on CC. There are large commercial bakeries who make all from scratch; large commercial bakeries who use doctored mixes; and large commercial bakeries who use the 50-lb just-add-water mixes.
I would definitely do a search. Tons of threads on this particular topic with good information.
Cake decorating has been a hobby and I have not been able to enjoy as much of it in the last 2 years due to family health issues, but I have always baked from scratch, that is how I learned.
My teacher taught me that way.
However, I am going to try the WASC method. I don't want the "box" taste. If my tasters and clients likes WASC then I will incorporate in my future baking. I am always open to try new things.
Here's an extensive thread:
http://cakecentral.com/cake-decorating-ftopicp-6030684.html#6030684
HTH
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