Best level 6 unit.

Yeah, and the wyvern is quite powerful, right?:D
Naga are just ridiculous, what's there to argue about?)))

It also depends on how quickly you can build them. For example, you can start building wyverns on day 2, and by week 1, you'll have a castle built, and building wyverns doesn't require a huge amount of resources (it's the cheapest for its level). As a result, you'll have 6 wyverns, while you'll only have 2 nagas, so who's stronger?