Personally, Warhammer orcs are my personal favorite with the broken speech, iconic face and brutish manners full of kultur. It surprised me to learn Tolkien orcs come from elves (and looked like mud hobos) but since Tolkien is a reference for anything fantasy I could not deny it.

So when I saw anime pig orcs I just shuddered... at this point, anything goes as far orc is concerned for me, at least shape-wise. I still prefer them to be a bit on the savage side though because a refined orc with a top hat just doesn't roll with me.