I have been pondering this, as well. Hope to be in WDW this fall.
I have a paid subscription with TouringPlans, and have easyWDW bookmarked.
For me, there are 2 different issues.
1) Crowd info for planning when to go.
2) Crowd info for which park to go to on each day.
As to #1, Both easyWDW and touringplans take holidays etc into account. However, things are missed - the influence of mardi gras this year being a good example. So, for instance, for October both sites will look at the major holidays (Columbus Day and Halloween). I am also looking at when schoos take their fall breaks. I do like easyWDW explanations. Also like the way the month is represented - whole month (including weather info), instead of each day individual .
As to #2, Here, I will be looking at both sites. But I will be taking other factors in account. I like the idea of spacing out the parks that take the most energy. Would rather not do AK in the rain. Those sorts of things.
I am looking forward to other strategies and ideas.