I think you have to take any crowd calendar with a grain of salt. It's all crystal ball gazing and without more information about how they determine their crowd indices (be it qualitative like "yup, it's all right" or quantitative like 8 out of 10), it's hard to really say which is "better". In that way, IsItPacked and RHMTravel (not heard of them before) are flipped. IsItPacked thinks 8/10-16 will be okay and 8/17-23 will be busy, whereas the other calendar has mostly 8s/9s for 8/10-16 and then 4s for 8/17-23.