If you'd like a nightblade playstyle, you should play a nightblade. Dragonknights don't offer a nightblade playstyle.
If high survivability and damage is your aim, magicka nightblade would be recommended. Stamina classes in general do more damage, but lack survivability compared to magicka.
Bs. As a stamblade i always survive stuff only a permadodgerrolling stam blade can survive its experience.
What amor sets an skils would be best for a stam wood elf more like a nightblade playstyle want high dps an survivability