Attack Power vs Spell Power

Ok i'm confused as to how exactly attack power affects us. Does ap help my consecration tps or do i still need to find good spell power gear if i want my consecration to generate high tps?
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Strength > Attack Power > Spell Power

Thats the basics of it
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Hinata of Crit Happens - 80 - Arygos

how would DMC:crusade help in threat then? its both AP and SP
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