Up front, the two hander does about twice the damage, and the dual wield hits twice as often. So that about evens out.
But if you have crushing blow that works on both weapons, like from boots and helmet. Then hitting twice as often, procs crushing blow twice as often. An advantage for dual wielding. If both weapons also have stats, like 20 strentgh, then that gives you 40 strength in dual wield, instead of 20.
Drawback from dual wield then becomes: you need two expensive weapons instead of one.
If you use berserk to finish of mobs or loners, the two handed weapons hits alot harder, basically twice as hard as the onehander you hit with in dual wield. I use berserk alot, as a one point wonder, together with whirl.
Edit for questions. 2: Not all weapons can reach fastest breakpoint. If so then reach tthe breakpoint before, and load up on other stats instead. Some weapons like Beast, adds Fanatiscm, that lower breakpoints. This can be an offhand in dualwield, together with hardest hitting eth weapon mainhand, for lowest breakpoint.
- My advice is Breath of the Dying collosal blade in two handed mode. Done and done. Life leech, mana leech, damage sorted. You can basically wear whatever you like with BotD, Shacos and Dwarf Stars and whatever. Death is cheaper and hits probably harder, can use that in a col sword too. But it casts freezing, that makes some bodies melt and can’t be horked. It does not proc this freezing in whirlwind, so, can be used. But if you use berserk you might lose a find item body.
Ladder start, make an Oath in eth weapon and start farming. Unique sword Doombringer, is pretty good for starters too, as an ofhand weapon, if you keep your health about 3000, you can use the health bonus to get more strength and thus higher damage. Worth bying for um or mal to get started.