Look at your choice in GT40s like sex. As a wise one once said, "The worst I ever had was wonderful!"
As for my choice in GT40s, ERA has a quality and originality that is hard to equal, let alone beat. I say this because of the finish you don't see. Flip up the front or rear body sections and you'll see that the undersides have finishes that equal the body exterior. John Horsman, who was John Wyer's assistant on all of the Gulf cars, commented on the similarity between the ERA GT and an original MkI GT40, i.e., notwithtanding the uprights to accept the Corvette wheel bearings and brake rotors.
I repeat, the worts I ever had was wonderful.