Outside of abyssea.
Fudo you get around 1100 Base DMG before Attack vs Def and lvl correction
0.6*200 STR with 114 DMG Masa +20 DMG from fstr = 254 Base DMG
254*3.65*1.19 = 1103 Base DMG before Attack vs Def and lvl correction
Torcleaver you get around 1080 Base DMG before Attack vs Def and lvl correction
Now Torcleaver with 0.6*170 VIT with 120 DMG Cala +5 DMG from fstr (+60 STR advantage to SAM) = 237 base DMG
237*4.75 = 1078 Base before attack vs def.
1103 is very close 1078 but ofc DRK can WS from anywhere on the mob
Now here's the kicker
Say the gear + skill on SAM and DRK are equal (excluding the STR advantage)
For Sam +60 Str = +45 attack
For DRK Attack bonus = +60 attack and Endark +50~
Meaning DRK will have about +60 attack on SAM which atm is about 8% of peoples base attack which will mean DRKs pdif for WS will be 8% higher and because there is no attack bonus on fudo or torcleaver it pushes Torcleaver past Fudo
and when u consider lvl dif on say a lvl 100 mob it'll decrease pdif by -0.5 ish.
and say SAM has 2.00 and therefor DRK will have 2.16
it'll change to 1.5 vs 1.66
1.66/1.5 = 1.10 = 110%
Meaning on high level mob the avg WS DMG is in torcleavers advantage.
How ofc you need to consider WSfreq or it's not fair.
w/ SAM it can 5 hit masamune
w/22% haste gear w/ March X 2 + haste + hasso = 67% haste
so 0.33*437*4 = 574.8 Delay per WS
w/ DRK it can 6 hit cala
w/ 23% haste w/ March X 2 + haste + LR = 80% haste
so 0.2*430*5 = 430 Delay per Ws in LR
w/ 23% haste w/ March X 2 + Haste + Hasso = 68% Haste
so 0.32*430*5 = 688 outside LR
LR is up 180 secs of 250
so 430*(180/250) + 688*(50/250) = 309 + 138 = 447 Delay Per Ws on Average.
447/574 = 0.77
1-0.77 = 0.23
So DRK WSs nearly 23% faster on just melee swings SAM does make up some from meditating and Zashins DAs.
Basically the LR buff has pushed DRK up alot when it comes down to WSfreq.
(Not to mention your hitting the mob alot more on DRK and harder as well)
Summary of the data.
Outside abyssea Fudo isn't stronger than Torcleaver infact there very close but the fact that DRK has an attack advantage on SAM means avg ws DMG wise Torcleaver will beat Fudo or there will be roughly the same on similarly geared players.
Now i'm not gonna say the math i presented proves DRK > SAM that's dumb cause it's situational stuff but since the Last resort buff allowing DRK to exceed SAM Ws Freq in combination of there superior melee DMG push DRK over SAM pure DMG wise.
As for inside abyssea i believe the fact Masamune has STR mod gives SAM an advantage on WS dmg w/ atmas but the SAM v DRK (DMG wise) thing is dumb in abyssea cause a WAR will just roll in with a ukko's and making it pointless to even think about.