Ironworks vs WoD

[NyarukoW]

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Augmented Ironworks chest: 47 crit x .215 = 10.105 INT + 33 spellspeed x 0.098 = 3.234 INT + 5 extra INT from being i130 vs i120 = 18.339 INT.

Demon Robe: 31 crit x .215 = 6.665 INT + 31 det x .284 = 8.804 INT equals a total of 15.469 INT....

The 3.234 INT from spellspeed should really be 0. So it is really only 15.105 which sless that 15.469. So the VIT is the determining factor, but you may give up a tiny fraction of DPS for it. More spell speed means constant casting leads to forced downtime to charge MP in stuff like T10 and T11 so DPS contribution of 0.