I figure it this way, I hate both characters.
So what I have to look at is how I hate which the least.
The Emporer, was realy just an old pedofile who outsoursed his work and had lightning fingers that always seemed to work more against him that anything.
Hordak, was basicly the power suply for Skeletor who does kick ass, with the only real thisg going against him was that he stared as She-Ra's villian. Eviler suroundings, Eviler troops, Eviler Powers...
I give it to Hordak one on one.
I say The Emporer on a grand scale cause much like the good ol USofA, he's got the bombs! I don't think Hordak would fair so well against a fleet of starships. That is unless he called in new Skeletor, cause he was cool!
But even still that wouldn't work cause the canceled third season had him primed as a userper