Hey there.
I've simmed Unholy versus frost as well.
What I get isn't like Skullflower's sims at all:
Single target:
Unholy: 60877 DPS on 450s patchwerks using Def+PL
Frost: 70562 DPS on 450s patchwerks using Def+PL
HecticAddCleave:
Unholy: 90162, 53269 on prio-target. UB+NP
Frost: 104395, 65458 on prio-target. Def+PL
This is with their 6.2 2nd July profiles. Either the APLs are garbage or Unholy scales insane with gear compared to Frost. Please chime in.
Frost Armory:
http://eu.battle.net/wow/en/characte...zabel/advanced
Unholy:
mythic warforged socketed Ka'graz's Burning Blade and heroic Loop of Beckoned Shadows instead of their Frost counterparts
Other than that, on live, Frost seems to have the upper hand on Hellfire Assault, while Unholy might be better on Iron Reaver due to stacking a NP duration during the air-phase. Frost can still do good here. On Kormrok there have been good parses with both specs. I found Unholy to be better in my raid comp/our strat.
I'm not sure what spec to play on Council at this point.