Nah, the stat gain from Prydaz is great for almost all encounters
KJBW is an amazing stat stick with sick amounts of Strength, and is a large dps increase
Uvanimor is a massive dps legendary as it improves the flow of your rotation so much that you will also see a drastic dps increase from it
Draughr though, used to be amazing pre-Tier 19 bonus, but will become good again with Tier 20 when we don't have wound application through Death Coil any longer
Uvanimor is as much, if not a tiny bit more of a dps increase to Unholy, than Necrofantasia is for Frost
Instructor's Fourth Lesson is a larger increase to UH than Toravon is for Frost (not saying by a large bit, but fairly)
Koltira's Newfound Will beats Draughr hands down this tier, and probably in Tier 20 too
KJBW is a solid stat stick for both specs
Perseverance of the Ebon Marty wrecked Death March completely in 7.1.5 (And is probably still a lot better than Death March in 7.2 even after the nerf)
Prydaz is a solid stat stick for both specs
Sephuz is a solid stat stick for both specs
Overall, both specs are in decent places with regards to legendaries I think