Everyday i do bgs and arena with my frost dk friend and we have the same gear and similar skill, and i myself is unholy spec. The frost dk pulls over 5 million dmg in bgs while i pull 3-4 million and his kbs are like 20+ while mine are 5+ . In arena he always tops the dmg even if he doesnt try, while i pop all of my cds and still barley top the charts.I feel that frost is still better than unholy reguardless of 20% strength buff. If i try to go frost, i'll suck at it alot, idk how to time the cds and etc. Idk which spec to pick honestly...