a6 4s necklace (volcanic heart) or a2 invisible beast (rare 4s silverbeard)

[indigo valve]

I know the 4s necklace is supposedly easier to awaken but it's stuck there for a month now.
Statwise, which has more atk? A6 4s or a2 rare 4s?

Assuming equal levels and enhancements

[tawny axle]

4s necklace with awakening is always better unless ur 4 rare get awaken 7