Hi Matt
I am one who consider the 1927 York Caramel (type2) as the Lou Gehrig RC.
I do have some bias because it's my latest pickup. (posted in the July thread

)
This card was on my list of "dreams" for many many years, and I sometimes still pinch myself when looking at it...
Anyway I think The exhibit folks have a legitimate argument as well, but this is just my opinion, I think the York fits better by some of the common designated "rules".
US Caramel wouldn't qualify in my mind.
You can't go wrong with either, but I think you should have both just in case...