Which third-level creature is the best?

here is the answer: if we consider the base increase – without a Citadel or Castle, then here it is:
1. Cerberus (+5)
2. Griffin (+7)
3. Golem (+6)
4. Elf (+7)
5. Serpent (+8)
6. Beholder (+7)
7. Ghost (+7)
8. Orc (+7)
I conducted battles both 1 on 1 and based on the base increase. Individually with each one. In total, it turns out like this.