I have the Armour Bodies and the seat pan is about 1/4" too thick so the race tail doesn't sit quite flush. Just fyi...it's the one complaint I had. I modified it but even so, it's still a bit too thick.
I have both as well. I didn't like the front mounting of the HotBodies seat because it uses the tank mounting holes and you never get them perfect so you'll end up ruining them. I used just the two back bolts to hold it down and it worked fine. It is conveinent to pop off and on quickly. I now use the armour bodies as it fits nicer and I only have one piece to deal with.
I'd save the money and get the HotBodies seat pan. I didn't notice a difference in riding between the two but the armour bodies does make you sit a bit higher up. Good if you have long legs.