The Husky Liners do cover more of the floor pan as can be seen in the photos in the link. However, I have to say that my Weathertech's cover all the floor I need them to. I wear size 16EEEE footwear and they cover all areas of the floor my feet get near/on. I can't see how anyone would need more coverage unless they had size 24 feet or were covered head to toe in mud or something?
I used to run Husky liners in my trucks. However I always had the same gripe with them and that was they rolled/curled in at the edges. I have never had a Weathertech that did anything but hold it's original shape 100%. Never had a Husky Liner that held it's original shape 100% for more than a few months.
Bottom line is either will work. Pick the brand you like best. Husky Liners have worked well for me but Weathertech Liners have worked better so that is what I went with.