getting back to why i said it was situationally better is because it gives refresh, refresh>perp, depending on how much it gives. and the reason why it doesn't beat bahamuts staff is because of the +5 smn skill, which effects our avatars directly. also, the reason i said claustrum has better dps is because of the numbers on ffxiclopedia,
claustrum: DPS: 11.08
ridill: DPS: 10.17
thats the base damage per second of all four, copypasta'd from ffxiclopedia.
back to main topic.
neck hands down (imo)would be summoning torque, for some reason i see higher spikes than when i use sac torque when in exp partys(i need someone to parse this), although to an uncapped smn skill character, sac torque may be better. with phi necklace for resting (+3 hmp)
best single earring is summoning earring, with magnetic or antivenom on the second ear, switching summoning earring with the +2hmp sea earring for resting.
rings are evokers and the -1 perp latent ring, if you have a setup to use it, if not, one of the 50 hp to mp.
back is the +5 smn skill cape from sea, invig cape for resting.
waist is qiqirn sash+1 just for the biggest +hmp boost, nothing really useful here other than maybe a spell interrupt waist, but no one uses them.
legs are a bit of a toss up, af+1(acc), relic+1(-2 bp timer and better for spirits), or marduks for +5 smn skill(better for buffs).
feet af+1 for keeping an avatar out, relic+1 for BPrage, nashira or marduk for +skill(marduk has the more useful secondary stats).
hands, nashira for perp, relic+1 for for BPs(rage or buff)
there's also a thread i participated in that has the best possible +mp setup ever, give me a moment and i'll find it.