Let's see, they had an N of 12. Not statistically viable for logging what carrier performs better where. This is most clearly visible in the express packaging

Let's see, they had an N of 12. Not statistically viable for logging what carrier performs better where. This is most clearly visible in the express packaging differences between FedEx and USPS which uses FedEx and they even mentioned it in their article. Bet it was fun doing/writing about it though.