Halfling stink less, are less likely to attack you after each use, and they don't hold grudges. Dwarves do all of the above, and I don't want to wake up (
if I wake up) surrounded by a clan of bloodthirsty, axewielding stunties if I can help it
Halflings it is, then, although I'd prefer the Gnome over the Halfling (their noses make gnomes more aerodynamic).