Defining a "GREAT" horse

I think turf horses should be held is higher regard that dirt horses. Dirt horses have many more options in the US than do grass horses. Grass horses usually face larger fields and they always have a blanket finish. In addition, US turfers get bombarded with Europeans. US Dirt horses dont have to worry about that. I think a turf horse who consistently performs at the top is more of a great horse than a horse that raced on selective tracks with selective races.