Whats better for a magicka DK in heavy armor for pvp?
Depends.
If you get infrequently hit by magical projectiles, defensive stance is a lot better. If you get hit with all sorts of projectiles often, then Dragonfire Scales is better.
Make Rush of Agony "Monsters only." People should not be consecutively crowd controlled in a PvP setting. Period.
Whats better for a magicka DK in heavy armor for pvp?
Depends.
If you get infrequently hit by magical projectiles, defensive stance is a lot better. If you get hit with all sorts of projectiles often, then Dragonfire Scales is better.
Also depends on if you run the asylum 1HS. Running that plus a way to regenerate stamina like bloodthorn is a viable option for sustain. Run asylum on your back bar with a damage set on your front bar. Valkyn or bloodspawn as a monster set.