The most difficult alternative

It's difficult to keep Nagas at a distance, especially when there's no one to teleport them behind the enemy. Besides, if you teleport them, they start getting taken down in groups, and that's not like a Griffin, which can withstand a mass attack with dignity!

On the other hand...
You want to have both Djinns and Nagas in your army, but it rarely works out. It's a pity that you have to choose between the two. :D