Depends on your taste buds, experience and the two actual cuts.
Some choice is actually just below PRIME.
The difference between the two is marbling.
I can taste the difference, but for Christmas, I did a PRIME and 3 of the family noticed and 4 of the family didn't.
I sure wouldn't spend a fortune on PRIME just to get it. What I got was just a little over the cost of choice.
Grading is a whole different issue. There can be issues with it.
Try a choice and see if you're happy with it.