Hmm. I'll lay some facts and you can do the math and draw some conclusions.
Stats are based off 3 things, but let us look at DMG first.
DMG ratio: This the based damage portioned to it's increments. For hypothetical example: For every 1 DMG you get 5 DMG for total (Total is in the Detailed) The Total damage also increase Skill Damage.
DMG % This increases your DMG ratio.
When equipped with x weapon DMG increased by x%: Raises weapon based DMG.
CRIT the same way but increases damage between 150%-300% depending on CRIT DMG.
So 15k Total -50% DEF is 7.5k damage
Where as 15k Total -50% Def by 200% CRIT is 15k damage.