Ribeyes get to the grocery store in boxes with 5 loins each. A case of select ribeyes will vary in quality from loin to loin in the same box. It's just a range of quality. I've seen times when I've opened a case of selects and it seemed as if every loin were choice quality. I asked the question of our meat buyers at our distribution warehouse once. He said it did vary occasionally due to inconsistencies at the packing plants. Sometimes the quality of everything that came in that day was higher than other days. When you have to fill a 200 case quota of "select" ribeyes, but all you have to chose from at the end of the day is "choice" beef, slap a "select" label on that box and let it go. Sometimes, there's just no choice.
That said, this link is for
@CFBHome
Select, prime, choice...what do grades of beef mean? And does the grade matter? A quick guide to understanding beef labels, plus when to save and when to splurge.
www.tasteofhome.com
Bottom line....as a meat cutter, I always told folks that 2 things had to happen for a steak to be good. It had to be cut right and it had to be cooked right. Do either wrong and even a "Prime" steak will suck.