I tryed many daggers for long time on diferent equipment but conclusion is only one. TH is the best dagger ever. Great for scouting (dash on silent move, stealth), superb for trains (dash, fake death, good HP boosted by +con tatoos), good for fight with nice power of blows. TH hasn't focus death but on many servers this skill is bugged or dont work prophetly, so choose TH. If you need dagger for pvp i think AW is the best in face to face, but AW havent dash, fake death, stealth so it's useles for scouting and training. AW is also fast but dash in good time is the best.
About equipment it depent for class and enemy, armour draco light or majestic, weapon AS+Haste :P because of skill regen or Naga Storm with back blow if you prefer backstabing ppl. Backstab with this dagger made by AW is devastating :)