Which third-level creature is the best?

The strongest units are Cerberuses and Iron Golems (although their speed is terrible, they benefit from counter-acceleration), Elves are mediocre, Griffons are slightly weaker than Cerberuses, Orcs are completely useless (in my opinion, they are the weakest unit), Dragonflies are average, Ghosts are also not very good, and Ice Elementals are decent (the downside is that they cannot be resurrected).