Here's the way I see it (as someone that doesn't play, nor will ever play, a Half-Orc, Dwarf, OR Warforged):
Dwarfs:
Smell really, really bad...
Warforged:
Can have their batteries drained, and there is NEVER an outlet around when you need one...
Half-Orcs:
Look Fiona-Shrek butt-ugly...
So I would say that Dwarfs make the best tank. Once the mob takes a wiff, they must make a Fort save (to stay on their feat), a Will save (to stay awake or pass out), followed by a Reflex save (to move out of the Stench cloud).