I don't think these polls aren't really indicative of much, it can change based on the state of where things are in the design/construction cycle. As more information comes out and construction begins the interest level of posters change. Its something I've noticed over the years being on forums like this.
Redo the polls in 6-9 months when Avengers starts construction and the poll might change with it leading. Or take the poll again in 18 months when Coco is in full blown construction and the poll might swing back to Coco. Or take the poll again in 24-36 months and it might show that Avatar is leading.