I wouldnt say DP is only good in Dyna. Both guns are very strong and I think possibly the added QD damage may make up for the lack ws damage. There sonly one person on ym server with DP and hes jp.
Following the QD formula:
(2 * (Gun base DMG + bullet base DMG + Corsair's Tricorne bonus)) * (1 + (MAB / 100)) * (Elemental Staff bonus) * (Day/Weather Bonus)
Assuming I have both guns 95 and QD in my max dmg set which has 32 MAB in gears(you can get 8 more MAB from ring/legs if you're really pimp though), no tricorne for recast-5 on head, and using QD bullet which is MAB+20.
And assuming using Zodiac ring+elemental Obi to match specific day instead of Aquiline, so dmg+13% but MAB-3 on that specific day.
Also assuming I use Pluto's staff for DP to boost LS dmg, and vulcan's for Arma.
DP's QD dmg on none-dark/lights day with correct obi but using pluto's staff for WS:(2*59+89)*1.52*1.13=508
Since DP has 50% dmg boost, it's QD dmg is 762 on none-dark/lights day
On light/darks day:296*1.55*1=458
687 with dmg boost.
Arma's QD dmg on none firesday:318*1.55*1.15=566
Therefore on Firesday DP will do 134 more QD dmg, 196 more QD dmg on earth/water/ice/lightning day, and 121 more QD dmg on darksday.
In VW my QD/WS ratio is about 1:3, in outside of VW like dyna is about 1:2 with 2 TP rolls, therefore in VW arma only needs to do 40~70 more WS dmg than DP to win, and outside of VW Arma needs to do 65~100 more dmg.
Considering WF average 1.8k~2k unless mob resists, and fire shot gives extra 300~400 dmg, it's very easy for Arma to catch up with extra WS dmg unless the mob has a dispel-able effect for dark shot to land(which is rarely)
If both weapons using Last Stand, following the physical WS formula, http://www.bg-wiki.com/bg/Weapon_Skill_Damage
Arma using last stand has around 112 more WS base dmg, so it still wins.
Unless you have long down time to push QD/WS ratio to 1:1 outside of VW, or unless you're not using TP rolls and gain TP like a slug, I don't see how DP can catch up tbh.
Doing DP is really nothing but an emotional attachment tbh.
Edit: If I'm outside of VW and shooting for TP, DP may win with higher /ra DPS+WS frequency, but I almost never shoot if I'm outside of VW. Edited, Jan 11th 2012 7:50am by Afania Edited, Jan 11th 2012 7:59am by Afania