I can't see what we'd do with houndoom besides a minor stat tweak, it already has a nice movepool and good abilities, unless we go all CAP1 on him... so I voted for farfy, damn you doomacrats :P
EDIT: I also think houndoom has a niche in OU, be it small, its not completely outclassed by anything in OU like arcanine is to infernape for the most part, farfy is nothing, in anything, period lol