Rain of fire vs Hellfire
If you're looking at a Madness of Deathwing parse, Rain of Fire will score higher, as it procs Spellweave; Hellfire does not. Rain of Fire is recommended for all three specs on Madness.
Aside from that, Rain of Fire for destro, Hellfire for demo, and Seed of Corruption for aff.
Edit: Though... Now that I think about it, Spellweave shows up separately... So.. Not sure how you got to that result.
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