Dual Wielding vs Two-Handing

[Lasci]

I'm not quite sure I understand the pros and cons of dual-wielding vs two-handing. I'm currently playing Skaven pretty heavily, so using them as an example would be the best. But as far as I can tell, they function similarly save for that dual-wielding has a consistent 30% damage reduction, while two-handing has a stacking 15% reduction per strike. Does this essentially mean that it's better to use two-handers early when you don't have as many attacks per turn or later on if you need your damage front-loaded for whatever reason?

Also, is there a difference between dual-wielding with fighting claws / weeping blades versus dual-wielding with two one-handed weapons?

[Balalaika]

Two-handed weapons are good for inflicting big damage. Therefore you take a two-handed weapon when damage is the top priority.
Dual wielding deals less damage, but gives you 2 important bonuses.
1. It give a possibility to combine up to 4 effects, 2 from weapons and 2 from runes.
2. It does not harm your position in the initiative ladder (unless you take 2 hammers).
Overall you want to take a two-handed weapon when you want damage, and nothing else matters. If you want to get a specific on-hit effect, or you want to be at the top of the initiative ladder while dealing a big amount of damage (not as big, as with a two-handed weapon) then you go for dual wield. As skaven it would better to go for dual wield, because speed is a very important parametr for skaven.

[Wendek]

Note that the Skaven dual weapons (claws and weeping blades) won't have the 2 runes advantage, as they're a dual weapons packed in one slot. They function a bit like two-handers as far as runes are concerned. (only one rune, but the effect is doubled)

Basically what the above poster said. Two-handers are especially good for Charge builds that want to frontload all of their damage, which as Skaven you may want to try on a Black Skaven. A big Mighty Charge with a two-handed weapon can take half the health of some units if it connects. On the other hand, dual-wielding is better if you have loads of attacks, like on Impressive units (as Skaven, your Impressive can only use dual-wield anyway so there's no choice to make), or if you want to use two different effects. (for instance, having two Maces will give you a pretty good bonus at hitting your opponents)