most SCH mains will tell you that sch has better mitigaion because of Crit adlo and deployment tactis... BUT heres the thing:

1.You can only use Deployment Tactis very few times in a duty due to its cooldown and you first need to pray u get a Crit and also pray the shield reaches everyone.

2. The difference in shield potency of Crit adlo vs Crit Aspected benefic is very very small. Adlo can’t compete with AB shield since it has no cast time,lower mp cost and its a way stronger shield with no crit and almost identical with crit.

3. Succor vs Aspected helios: Helios is also stronger and more mp efficient than succor.

If you think about it AST has better (constant) less rng based mitigation than SCH which is ironic lol. getting lucky with a spread crit adlo before boss ultimate doesnt = you did better mitigation overall in the entire duty.