Debuff > Buff
Reason 1: Debuff is based on time (180 sec) and buff is based on turns, usually max. 3T.
Reason 2: Debuff has no diminishing return. The boost through buffs gets less once you have skilled up your assault weapons.
Ability damage up is summational to its own multiplier. For example your ability deals 4.5x damage, and you have 30% ability up. In total you have 4.8x damage. And the damage is calculated in the description above.
The total damage output you are dealing divided by (1-defense down) is the final damage.
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Imo the team 1 is much better. Satan is the weaker version of the dark amon, you just need one for you team. Dark team lacks healing, so ama can heal a bit even not so much.
With Dark Amon and Ama you can get 45% defense down and 20% attack down on boss. And beelze's rage gives your incredible damage boost too.
Ama is far superior to satan. If you want to build a fire team somehow, ama is must-have too.
22K, thats a lot jewels.... but whether you get the SSR you want, it's a different story.
I would keep 1st acc as main and 2nd as raid twink.
Hades fits best in your first team, if you can manage to get her...then you will have 40% attack down and 45% defense down on boss, then attack boost from beelze and heal + defense up +blind from ama and hades and boss ragemode killer/Damage dealer Amon... ... Satan? No space for her.
This team is almost optimal, except some type disadvantage of fire and the weapon skill buffs, if you use dark weapons + eidolon only.
In the future, you could replace fire ama with dark ama, who has almost the same skills and debuffs.
And maybe thanatos replacing beelze, which provides C frame defense down, so u can reach 50% defense down max. On the other hand you will lose the rage buff from beelze.