Assuming i110 average, decent kill speeds and decent healers:

T1-4 and all HM Primals: STR accessories
T5-9 and all 2.1 EMPs: STR or Ruby. STR for when your healers are really solid or not DPSing, Ruby when they're good and/or DPSing as much as possible.
Ramuh: VIT if one tank strat, Ruby if two tank strat
Shiva: Ruby
T10: Ruby if OT, maybe MT
T11 - 13: VIT on PLD, VIT/Ruby on WAR with current strats.