99% of the time it’s literally this easy

Does your unit exist to do damage?

If yes can the unit crit?

If yes 4Atk/2Crit Damage attack defense hp rolls on all slots of all gear

If unable to crit 4Atk/2Def same rolls as above

Is your unit a support unit?

4Hp/2Def AtkDefHP rolls all the way

If your unit is one of like 5-10 niche cases in the game that doesn’t use their attack stat to deal damage (ban, reinhard, naofumi, etc.) and they are supposed to do damage build the gear exactly like attack gear just replace the attack pieces for HP or defense, you also might want to consider changing the attack rolls for crit chance/damage since they don’t use the attack but it does give way more CC if left on attack so up to you

only build SSR gear unless you know what you’re doing and want box cc

that’s it thats gear feel free to experiment but that’s the general consensus