I look at both easy WDW and touring plans. To date they seem to be similar in predictions, but if they differ, I'd rely on easy WDW because of the explanations behind the numbers. // I still use touring plans though too for the touring plans and ride descriptions though, not for the crowd calendars per se. I also like it that touring plans keeps me up to date about times of park opening and closing, ride closures, parade schedules, etc. -- that yes I could get somewhere else, but it's all one stop shopping here.
If you are only looking for crowd calendar basic numbers, I'd go with easy WDW, as it's a freebie too.