Not the real Bourbons.
By that I assume you mean the Capetian Bourbon's whom will start out in the 14th century? I did consider playing as them, but in the end figured that a game lasting only a few decades wouldn't be very interesting. Hence, choice of the earlier Bourbons.
Who by the way are just as "real" Bourbons as the Capetians... in fact they are older and hence one could make the argument they are the "real" Bourbons.