whomever you select, just recognize that the crowd levels have increased a lot in the past couple of years, so it will feel more busy regardless of what the crowd prediction number says.
I believe TP relies on historical data and statistical modeling, so the operational changes (less capacity & staff due to #FundShanghai) & attraction closures in Epcot & DHS for expansion is probably making their predictions less accurate then they would like right now.
I use both EasyWDW and Touring Plans, often times they don't agree on the "best" park, but often they do agree on at least 2 parks not to attend on a given day, so I just pick one of the other ones.