I have a dumb question for yall. When using burst mode characters, do you actually use the new burst abilities, or just use the skills you equipped?
Cecil's BSB has good commands. They're both holy attacks, and the 2nd one is a 2 hit ability. With some +holy equip like his Excalibur and a Platinum Shield, and the +50% enholy from the BSB itself (maybe +holy RM too, like from WoL), the 2nd burst command should hit 9999x2 AoE on all but the top ultimates, which is like having a free unlimited aoe saint's cross. His first burst command should always hit 9999 + a minor ~2k'ish self heal, which is nice on ultimates.
Vaan's BSB has excellent commands. They're both 2.1 damage breakdown's, with ninja casting speed (I think 0.8 cast speed?). Vaan in burst mode (self haste, +10% more speed from burst) chain casting his burst commands can almost completely re-fill his limit gauge by the time his burst mode wears off, not to mention getting so many attacks in such a short period of time means he outdamages my entire team. Definitely the MVP of my roster. Oh yeah, and his bursts are both full strength breakdown debuffs, which frees up the rest of your team from those duties.
Ramza and Cloud's burst commands I rarely use. For Cloud, the burst attack itself is a huge modifier, I think 9.5x damage or something? So it's better to chain cast lifesiphon even in burst mode, so you can cast the actual BSB more often. For Ramza, when I actually use his bsb (rarely), he's usually busy with maintaining fullbreak + a breakdown, which doesn't leave him time for the luxury of just randomly dps'ing with his commands.
That's the only four BSB's I have!