The following compares the current state of Demonology Warlocks to Unholy Death Knights using the latest SimulationCraft data for end-game PvE in World of Warcraft The War Within patch 11.0.2.
Comparison
Category
Winner
Unholy Death Knight
+13.23%
When simulating boss fight encounters, Unholy Death Knights averaged 13.23% more DPS than Demonology Warlocks (+204K DPS).
Unholy Death Knight
+21.13%
When simulating AoE DPS, Unholy Death Knights averaged 21.13% more DPS than Demonology Warlocks (+200K DPS).
Unholy Death Knight
+49.84%
Unholy Death Knights have higher spike damage potential, achieving +2.9M more DPS than Demonology Warlocks.
Spike damage is the peak DPS achieved in any given moment and is not sustained DPS.
Demonology Warlock
+2.66%
When upgrading the gear for both specs by +44 ilvl, Demonology Warlock DPS improved the most, +2.66% more than Unholy Death Knight. In total, Demonology Warlocks DPS increased by 67.63% and Unholy Death Knights by 64.97%.
Unholy Death Knight
+12.63%
+ Movement and latency lowered the DPS by 6.15% for Unholy Death Knights.
+ Movement and latency lowered the DPS by 18.77% for Demonology Warlocks.
When introducing occasional movement and real-world latency, Unholy Death Knights performed better, as Demonology Warlocks suffered a +12.63% DPS loss.
Demonology Warlock
When evaluating abilities used during boss encounters, Demonology Warlocks had fewer damaging abilities in total, indicating a potentially less complex rotation.
The comparisons above highlight some of the key differences between Demonology Warlock and Unholy Death Knight in the current meta, which can hopefully help you determine which spec to play or group up with.
Unholy Death Knight
Demonology Warlock