Single Target and AoE scenarios:
However, the best way to calculate stat priorities for your character is to “SIM” your character on Raidbots.
Strength is your primary statistic. It increases your attack power, which determines how much damage your abilities do. You should prioritise it, that’s why choosing a piece of gear with a better item level (so more Strength) instead of a piece with good secondary stats is often better.
Mastery, through Mastery: Frozen Heart, increases the damage of your Frost abilities. This secondary stat is important because Frost damage makes up a big portion of your DPS as a Frost Death Knight.
Haste increases your attack speed and your Rune regeneration rate while also decreasing the global cooldown.
Critical Strike increases your chance to critically hit with all spells and abilities.This has good synergy with the Killing Machine ability.
Versatility increases damage/healing done and reduces damage taken.
The best way to calculate stat priorities for your character is to "sim" your characterFind out how to sim
Dark Iron Dwarf is the best. Fireblood is a 2 minute cooldown that gives primary stats, which is really strong as a Death Knight. It can be used with Breath of Sindragosa. This racial is even better because you can dispel some bleed effects in Castle Nathria and gain more stats.
Mechagnome is also good. Combat Analysis gives primary stats, which is really strong.
Main-hand Weapon: Rune of Razorice
Off-hand Weapon: Rune of the Fallen Crusader
Mastery: Masterful Jewel Cluster
Flask: Spectral Flask of Power
Potion: Potion of Spectral Strength
Stone: Shaded Sharpening Stone
Armor Kit: Heavy Desolate Armor Kit
Health Potion: Spiritual Healing Potion