I am a lifetime member of Cooking Club of America as well as a member of DC. I belonged to CCoA first, or I probably would not have paid to join. I like both of them. Two of the biggest advantages of DC is that it is free and it is kind of like one big family. There is a family feel at CCoA as well, but on a smaller scale (to me anyway). Three things I love about CCoA is they send a monthly magazine, they have sweepstakes every month (I won three potato peelers but nothing big yet), and you can test products (and keep the products you test). I haven't gotten to test anything too big yet, but I did get a baking pan, a silicone pot holder, and several smaller things. When you test a product, btw, you write a review of it, which may or may not be printed in the magazine.
That said, I paid around $300 for my CCoA membership (they did send a set of stainless steel pans, an apron, and a few other things, for joining) and I rarely go there. DC is free and I am here every day.