Barbarian dual-wielding or 2-handed?
DUAL WIELD VS. 2HANDERS The Basics
If a 2 Hander is exactly 15% more DPS than two identical 1 Handers dual wielded, single target sustained DPS is identical. For example, a barbarian cleaves 4 times then hits Hammer of the Ancients on a single stationary target (remember what I said about simplifying assumptions for sanity?)
Barbarian has 100 strength. 1H weapon - 10 Damage, 1.0 Attack/sec - 10 DPS, with Dual wield bonus, becomes 1.15 attack/sec 4 Cleaves, 1 Hammer of the Ancients Total Dmg = 136 Total Time = 4.348 sec Net DPS = 31.3
2Hander - 15 Damage, 0.767 Attack/Sec - 11.5 DPS 4 Cleaves, 1 Hammer of the Ancients Total Dmg = 204 Total Time = 6.52 sec Net DPS = 31.3
Now, are 2Handers exactly 15% better than 1Handers? While leveling, this is hard to say, since item tiers unlock at weird levels. At the top end, the Arch Axe (top tier white 1H axe) has an average dps of 280.45. The Decapitator (top tier white 2H axe) has an average DPS of 566. Of course that doesn't mean jack squat since we're going to be using magic items anyways.
As far as I'm aware, 1H and 2H weapons have access to the same magical modifiers. So theoretically, dual wielding should give more stats.
Regarding itemization, items on a weapon that affect attack speed and damage directly, only apply to that weapon. I believe italso applies to any modifiers that are "On Hit". If the D2 system is still in place, this also includes life leech. This needs verification
SOURCE and more info on Barbarians
Here is a brief summary:
One 2-handed weapon:
- More damage per hit, but generally slower
- Higher weapon DPS values than similar level 1-handed weapons
- Less stat bonuses
- Individual skills hit harder due to weapon damage
Dual Wielding:
- Less damage per hit, but generally faster
- +15% attack speed bonus
- More stat bonuses since two item slots used
- Skills hit less hard, but more often
- Faster fury generation due to more frequent attacks
- May crit more often, powering some skills
Personally I prefer dual wielding with Barbarians and Monks because of the faster resource generation. I feel this allows me to use my big skills more often, which I find more fun. But 2-handers do offer larger individual hits and crits, if you don't mind the longer swing timer and don't have fury problems.