I understand that a Prime Rib Roast cut from the back end, which consists of ribs 9-12 (also called "the first four ribs" for some reason) contains the largest part of the eye muscle and is the most desirable. Ribs 6-9 then, while still an excellent piece of meat, is a little fattier, less regularly formed, and not quite as tender.
I'm having 15 people for Christmas dinner. Is there enough of a difference in the two cuts described above that I should get 2 of the 9-12 roasts? Or should I just get 1 6-12?
Any thoughts or suggestions would be appreciated before I re-mortgage the house to buy it.