WHM vs. SCH -- What is the basic difference.

[DreamWeaver]

As a WHM main, I have a question to veteran Scholars, hope I can be enlightened

Sacred Soil Usage for raid damage reduction, personally I feel SS should be used for Levi Ex 4 spumes + tidal roar phase, moogle Ex meteor, T9 megaflare, and T8 Allagan Field + Defensive Maneuver ONLY, as I can only think of these 4 situations where without SS, a party wipe may occur. Why bother using for any other AoE damage? With SS, medica 2 suffice, without SS, medica 2 also suffice, why waste an aetherflow stack for any other raid damage situation other than the 4 I listed above?

PS : For those with reading comprehension, I am talking about Sacred Soil Usage to reduce raid damage, not Sacred Soil Usage to provide mitigation on tanks (which I personally found to be more useful).

[Gallus]

Any good SCH knows that lustrate>>>>>>>>sacred soil in like 99% of the cases.