Aether Raids, Def or atk fort?

Atk is more important than def imo.

I did offense. In my eyes, I'll gain more lift due to the offensive fort than losing lift due to the defensive fort.

Remember, you can only lose lift every 20 hours, and even then you can still win that battle and be protected.

Welp, att some Tier You Will bem able only to do offensive 2 times a day, but If You are unlucky, more than that a day Will be the number of atks to your "castle".
But depends on your formation.
Even with less statuses, with pain +Savage staff users and dancer, You can Destroy every high resistant on the field.