Soul Defiler will outdamage Frostwrath ever so slightly. One reason is because the rate of FW's proc isn't the best. Also the higher in level you go, the proc gets resisted a lot. Soul Defiler's proc will also allow you to recover mana in combat to land another clutch Drain Soul which is 338 HP you might need.
Personally I use Greenmist if I already have Soul Defiler proc because the lifetap effect lasts so long and I can swap to epic to have their effects stack if lucky.
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