Crafting: Armor Penetration VS Sunder VS Guard Damage VS Barrier Damage [NO SPOILERS]

[frostyshad]

What is better against serious enemies for range damage dealers, mages and archers?

— Strong enemies have Barrier or Guard
For an example difficult elite mages have Barrier + ability to gain Barrier on being hit. This is means, after two Dispels (usually maximum in group I can take only 2 mages) elite mage still has ~5%-10% of Barrier, and this Barrier regen when the mage being hit, a very hard to defeat...

A dragon has massive amount of Guard, also dragons have an ability to regulary restore Guard to maximum. Hard to fight very.

Strong elite rouges can 'one shot' an any hero' party member regardless of Barrier and Guard applied with devastating ambush attack in battle. Hard to fight. I wonder what amount of damage they dealint? Probably the same as that foolish pale guy on my protagonist current 24th level, I mean something like 50k DMG with single skill.
But Cole cannot defeat any elite enemy with a single blow — because usually Elite is around 100k HP plus Guard/Barrier plus lot of Armor. I wonder HOW MANY Barrier enemy Elite mage have, when 50k DMG only make is decrease slighter...

P. S. Difficulty Nightmare + all Tirals always ON

[frostyshad]

Tested: Sunder is the most powerful - because it is additive. So you need only one char with Sunder in the group, and those crafting can be focused on Critical Hit Damage for an example.
Armor Piercing is pretty useless, because usually fight a pretty long and Sunder lowering armor. And actually, Sunder effect have some abilities of characters.