Quote Originally Posted by Lyrica_Ashtine View Post
It's been tried and tested before that stat reduction in percentages translates into a percentage less damage dealt, assuming enemies use the same formula like the players. Ergo: -15% str, dex, int and mnd reduces physical and magical (healing) by roughly 15%. Also, disable can't be considered "flat mitigation" if Virus isn't. It reduces action potency by 10%. Then there's the thing that CU renders you immobile/unable to perform actions for it's uptime where sacred soil does not. But let's not go there.
What we can say is that disable and virus play nice with each other. In that using Virus locks you out of additional Vriuses, but not disable. Meaning that your maximum uptime for mitigation debuffs is greater when mixing the two, or you can stack them for more peak mitigation. This is probably the more relevant factor to consider for composition than which of the two is stronger.

It could be argued this creates a "Pro" for AST in that their abilities compliment and compound with those of a SCH better than do WHMs or another SCH. If we want to be really silly and run with edge case mitigation you can have Bole + Virus + Disable + Sacred Soil + CU + Galvanize + Stone Skin out of an AST/SCH combo and you can't really get anything else comparable out of any other two healer setup.