User blog:GunsSwordsFlames/which "Special Round" do you prefer?

The Special Rounds are awesome rounds that brings in harder and interesting rounds that are hard to deal with then the normal zombies. The question is to you guys, which "Special Round" do you think is the best?
 * Hellhound
 * Pentagon Thief
 * Space Monkeys

I honestly think the Hellhounds were the best since they are more faster to strike and kill and packs were even harder to deal with.