I can not speak to anything about a B & B kit, but having built (and sold) a FFR kit I can only point you to
www.ffcobra.com.
FFcobra.com it is the most active cobra web site on the web. Follow it for a week. Check out the FAQ's, check out the picutres of builds in progress. When I had a problem during the construction of my FFR I would go to ffcobra.com post my problem and within 20 minutes have three replys from people that have been there and done that. Many times with pictures attached. The user support from other ffowners is second to none and second is far behind.
Even this site clubcobra.com which covers all things Cobra has less than half the activity of ffcobra.com, which is dedicated to only one manufacturer. Check it out you will be educated.
From what I hear the B & B kit may have a better "raw" body but unless you are doing your own body and Paint work I think it is meaningless in the final product.