Why is Duncan Hines yellow mix better than BC?

I had a recipe at Christmas for a white chocolate pound cake, and it said to ONLY use DH. Of course, the grocery store was out, so I used BC. It fell apart! I was impressed, so last week I bought Duncan Hines so I could try the cake again and compare. Now, I have lost the recipe. It had white chocolate chips and sour cream. I guess this is 2 questions in 1. Thanks for any scientific answers comparing the 2 cake mixes AND recipe tips for the cake.