I chose Omega weapon (8), because i dont consider it a victory if u cant survive your enemy's attacks (ie u escape them with heroes, holy wars, invincible moon, the end, limit breaks overdrive etc), and you gotta be at the TOP of your game to survive attacks like Megido Flame, Light pillar, LV5 Death; let alone damaging an all-element absorbing boss and all-status immune (save for vit 0 ~ Meltdown)!
but i had a few tricks up my sleeve
!
liek: im talking about devouring thousands of creatures (ability) and GF Shielding (summoning a low compatibility gf with high HP to shield character from damage) and junction manipulation (amnesia greens + items) for perfect gf abilities to each character
so yeh, that's my choice!