Every subclass is good in both pvp and pve, why? Because it gives different benefits, e.g. Sunsinger can self res on hard mode raid or even on strike if whole team is dead. On pvp Sunsinger can help in Osiris/Elimination/Salvage or just trick the enemy in any mode. Defender can give armor/damage buffs and can generate orbs too in both pvp and pve. Gunslinger can do anything DPS on boss, generate orbs from adds and kill any thing in pvp. I could tell more about each sub class. All classes are good if you know how to use them well, thats my opinion. My fav class is warlock, and actually if you use stormcaller the right way it is more powerful then anything, use the ability that gives you slower super drain when Granade and Melee is charged and well just electrecute their asses ;D (I managed to wipe the whole enemy team twice with 1 super use, killed all 6 they respawn and i still had half of my super and they died again) and best thing.... im a PVE guy ;)