So I'll quote my reply from another thread:
Shadowlordx wrote:There's also the Serpent Blade:
13-39 +dex (note: attribute dmg is added as (attrib-10)/2+min dmg= new min dmg, attrib-10+max dmg = new max dmg, so say 6 dex is = to 3-6 dmg for 4.5 dmg added to average dmg)
3.5 cooldown
+15 Acc
DPS(Avg DMG/CD)= 7.4 + dex/3.5
compare to Moonblade:
10-31 +dex
2.8 cd
+10 acc
DPS = 7.3 + dex/2.8
compare to Fist Dagger:
9-27 + dex
2.7 cd
DPS = 6.7 + dex/2.7
compare to Meteor Hammer:
24-72 +str
4.5 cd
+20 acc
DPS = 10.6 + str/4.5
compare to Bane:
27-82 + str
6.3 cd
DPS = 7.8 + str/6.3
compare to Cutlass:
12-36 + str
3.3 cd
DPS = 7.2 + str/3.3
compare to Sickle Sword:
15-46 + str
4.5 cd
+5 acc
DPS = 6.8 + str/4.5
Assuming max in Light Weapons or Heavy Weapons:
Serpent Blade: 26-78 + dex, DPS = 14.8 + dex/3.5
Moonblade: 20-62 + dex, DPS = 14.6 + dex/2.8
Fist Dagger: 18-54 + dex, DPS = 13.4 + dex/2.7
Meteor Hammer: 40-142 + str, DPS = 21.2 + str/4.5
Bane: 52-164 + str, DPS = 15.6 + str/6.3
Cutlass: 24-72 + str. DPS = 14.4 + str/3.3
Sicklesword: 30-92 + str. DPS = 13.2 + str/4.5
Take the DPS values with a grain of salt however, if you're not fast at clicking or spend tons of time dodging a mob such that you're not maximizing you're time spent on cooldown you're mileage will vary. If you are hitting attack every time a weapon comes off cooldown however, low cooldown weapons scale much better with the attribute which increases their damage. On the other hand, low cooldown weapons with lower damage will get reduced more as a percentage of their DPS by armor than slower hitting higher damage weapons.
A couple things to note: as light weapons you can dual wield with 25% less dmg on a rogue or 40% less on all classes. For Rogue: Dual Wielded Damage for Moonblade + Serpent Blade (Fist Dagger might outdo Serpent Blade at high dex values, although I suspect they would need to be extremely high to beat the Serpent Blade's bonus accuracy) = ~25.8 + dex/3.5 + dex/2.8 which pretty clearly beats meteor hammer in terms of dps (though the hammer can be used with a shield) and blows bane way out in terms of dps, also the damage is quite comparable to meteor hammer when not considering cooldowns (fixed to take account of the 25% dmg drop for dual wield), 40-122.5 vs 40-142, but dual wielded weapons will get twice the attribute bonus and twice the armor decrease. Dual Wielded Cutlasses(Technically 1 Cutlass and a Bonesaber, very similar damage to the cutlass but slightly better, though I can't remember exact stats) on a Barb might end up outclassing Rogue with Moonblade + Serpent Blade (The Barb will have a dps of ~29.7 + 2(str-15)/3.3 at level 15, although the accuracy a Barb will have will be horrendous compared to a Rogue), but the base damage of the weapons isn't to blame here.
The particularly relevant thing here is that a Barb dual wielding may actually be the strongest dps possible (though with terrible accuracy compared to a rogue), particularly ignoring armor, although dual Venomfang Picks(9-27 + str, 4.5 cd, -20 armor) are almost certainly the strongest weapon combination in the game vs armor.
Now if you aren't dual wielding, can't get two venomfangs versus armor, the results are a bit mixed, though I would argue the early game heavy weapons only beat out light weapons versus armor and have similar/less dps (and damage) otherwise, but for end/late game you should really be comparing dual-light versus 2 hander + shield, and in this case dual light generally compares quite favorably to heavy weapons (Cutlass + Bonesaber has a DPS of ~29.7+ 2(str-15)/3.3 at level 15 for Barb versus 23.6 + (str-15)/4.5 dps for Meteor Hammer; if you say but you can't maximize the cooldowns, double sicklesword is 26.6 + 2(str-15)/4.5 dps though Meteor Hammer probably comes out ahead due to the increased accuracy, but the damage calculations favor double sickle sword (the one exception is if armor > attribute damage bonus, in which case since for dual wield armor is doubly effective versus it, but in that scenario for 20 armor or greater venomfang picks have an effective base damage of 29-47 + str, 4.5 cd, which is for a barb a dps of 32 + 2(str-15)/4.5.