If you want to do varieties, then let's just do a sidebar. Pick one of them as standard (desert, I guess), drop the appropriate speed in the statblock, and write a sidebar?
So... desert is the main kind?
All ghuls take only half damage from falls.
Insight bonus to AC seems interesting. But I should point out that efreets have a +6 natural armor bonus. An undead of the same having an additional +2 isn't that out of the ordinary. I'd be fine with all that AC coming from natural armor.