@Caith -- I do not see any raid pet frames on your ui... are they there or do you not have any showing? Being a healer that is semi-important to me ^^ (ex. It's nice to see for vehicle fights like Leviathan or Malygos)
No no no. First of all, unholy aura provides run speed. But even if you don't usually run with an unholy death knight, it's clearly better to get run speed from the boot enchant. The increased crit damage from the other meta gem is worth a lot more than 12 hit/crit.
So if I have a DK unholy, the best meta gem you are talking is the 21 crit + 3% increased crit dmg? Or the spell power ones for affliction is better?
personally i've been playing around with a blood/unholy build since our nerf. The extra stam and survivability added with rune tap, and spell decflection. 25/5/41 is what i've been playing with and have had no troubles so far in 25 ulduar up on iron council. replace OB with SS and have fun