Dat staff.

If I remember correctly, you have the following speed boosts:
Booster (-2)
AYA (-1)
Body Boost (-2) (Is this independent of AYA's speed boost? I'm assuming so)

So that's -5, assuming Body Boost is always on (Is that a thing? Can people do that? You'd need a lot of buff duration), which brings you to Faster(3) with a Slow(8) staff. Finishing Blow (990ms) + Sweeping Staff I (240ms) + Sweeping Staff II (300ms) is 1530ms at Normal(6), 1440ms at Fast(5), so 1260ms at Faster(3) and 1170ms at Faster(2).

So, an Elemental Staff would be 7.6% faster than a Slow(8) staff, so, for a slow staff to be better than an Elemental Staff, you'd need to the difference between the magic attack on the staves to be greater than 7.6% of your total magic attack, and 23% if you ignore Body Boost (Slow(8) would become only Fast(5) in this case).

If we look at the duration of Body Boost, it's 90 seconds with Union Aura, with a 120 second cooldown, so 75% of the time, you'd need an increase of 7.6% magic attack and 25% of the time, you'd need an increase of 23% magic attack, which averages out to 11.45% more magic attack.

I would say the elemental staff is a good investment, unless you're planning on getting a Fafnir staff or something. I'm not sure what your stats are, but I'm guessing it'd be difficult for a slow staff to match the elemental staff, but again, it depends on what your total magic attack is.

CD is 90 seconds for BB, so effectively BB is on 100% of the time with Union Aura.

I don't quite recall AYA-BB being additive on top of AYA, so I think it should be a -4 speed stage with BB on. That was why SI/DSI+IA was so ridiculously important for BaMs with Elemental staves, and why Estaves cost a bullpomegranate (also because it's the highest level-scaled staff.

Estaves start at 178MA, and Fafnirs start at about 204 i.e. to have an MA match-up you will need 342 MA to start off, which is on the lower end of the highly funded regime. A clean set of everything (say... Empress with shoulder + Mystic + your usual skills) already gives you 300-ish MA. That difference of 26 MA is miniscule compared to IAS as a ultimate final multiplier (which in a way is true, maybe except for PDR).

edit: sorry I took my time to do some research but not exactly counted as ninja-ed

Hadriel

Oh, really? Dammit, [MENTION=5537]Locked[/MENTION]; do resistance skills tables.

The Fafnir Staff is 204matk clean, so if we compare a clean Fafnir Staff to that particular staff, it's only better if you have less than 223 matk total, which is really unlikely. Not counting the boss damage on the Fafnir staff, if that actually works, anyway.

Okay, done. Along with Sengoku/Nova/Mikhail.