I consider my pie chart to be superior as I've pedaled to all of my locations. I've worked for my pie chart and not sampled them from the comfort of a car. Equally, my ratings are quality assured by having a single point of reference, me.
Furthermore, my chart is more specialised, focusing on porcine fillings, no need to calibrate to accommodate vegetarian, fruitarian, chicken or other species.
Yet to find a pie here in the States though. I might get around to creating a pie blog, plog for short, on my return. It will be a superior site, rest assured.