Seducer will be better to be honest.
If you have low CP you will definitely need it and you don't really need high damage until you start doing Vet Dungeons in HM or Vet Trials and while you can start doing Vet Dungeons with 250CP for Vet trials you will have to wait until you get 450cp depending which one you do.
If you are already max cp Julianos is way better but it really depends on the class.
If you tell me your CP, race, class and the purpose (PvP, PvE, Quests, Trials, ect..) I can help you more.
For a Nightblade? Run Shades and the Necropetence Set for one 5 Piece, then Seducer for the other 5 Piece, then use a Molag Kena shoulder.
Then you can make a Sharpened Staff instead of trying to farm it.