In very general terms:
Nightblades:
-Have better burst damage/stealth ability
-Have more passive boosts to damage output and weapon usage
-Are more mobile with a reliable stamina gap closer and major expedition
Dragonknights:
-Will have higher sustained (but lower burst) damage
-Will have better defenses/survivability/utility
-Have better resource management
I play both, and stamina builds for both, and they're definitely both fun classes; very different playstyles though. The nightblade focuses mostly on trying to kill the target as quickly as possible: you want to maximize burst damage and use stealth to your advantage. You play more like an assassin (though, oddly, 2h works better for nightblades here than dual wield does).
The dragonknight uses stealth far less often, and is more of a front line fighter with some extra defensive perks to survive incoming damage while fighting. The DK also is a little slower paced, relying on stacking damage over time effects on enemies and then letting them burn to death while you tank any incoming damage.
In very general terms:
Nightblades:
-Have better burst damage/stealth ability
-Have more passive boosts to damage output and weapon usage
-Are more mobile with a reliable stamina gap closer and major expedition
Dragonknights:
-Will have higher sustained (but lower burst) damage
-Will have better defenses/survivability/utility
-Have better resource management
I play both, and stamina builds for both, and they're definitely both fun classes; very different playstyles though. The nightblade focuses mostly on trying to kill the target as quickly as possible: you want to maximize burst damage and use stealth to your advantage. You play more like an assassin (though, oddly, 2h works better for nightblades here than dual wield does).
The dragonknight uses stealth far less often, and is more of a front line fighter with some extra defensive perks to survive incoming damage while fighting. The DK also is a little slower paced, relying on stacking damage over time effects on enemies and then letting them burn to death while you tank any incoming damage.
^^All this!
Short version,
StamDK- heavy armor and tanky class.( Never die)
Stamblade- medium armor and burst class.( 1 hit KO)