When is better to go to WDW: September or early to mid November before Thanksgiving?
I’ve done both and I’m partial to early to mid November. For me September is just way too hot at WDW - but that’s just me 
It depends on what is important to you. September will have slightly lower crowds, but it will be hotter and it is hurricane season. In terms of special events, September has MNSSHP, whereas November has MVMCP. My own preference is for November, mainly because of the heat, but I would like to see MNSSHP…
If you plan to swim, go when it is warmer. If you want to last longer while touring the parks, go when it is cooler. Both times have their perks.