Right. Eyebeasts can hit multiple targets, poision targets (they could in GF2, at least), and stun multiple targets. Drakons could hit multiple targets, but in my experience their strikes were either ineffective or missed. As for surviving longer, rotghroths have about the same. Rotdhizons have more. Eyebeasts don't need more hit points, because nobody (could) touch them. Even with the eyebeast downgrade, it's still better than drakon and ur-drakon in my opinion, at least.