Imo
Any decent ast with a brain will tell u
- Ast + sch =\= automatic dirunial sect
- ast + whm =\= automatic noct sect
You have to assess party and what instance ur doing.
I go noct always on rav ex as my noct aspected benefic really helps ease off the tank busting moves. Having the sch try to shield before tht buster is like so ur gonna hard cast while party is getting hit with atma linga lol. Also if ppl get burned before prelude to liberation purple aoe, 9/10 times my aspected noct benefic will make them survive.

Also i really like it during bismark ex during p3 add phase as it helps shielding the tank with the 3 adds before the island slam.