I think both subclasses have pros. I like the sunsinger because the grenades seem to regen a lot quicker and are a lot stronger. I also like the levitate and shoot perk. I like the voidwalker because for whatever reason my melee is a hell of a lot stronger and regens super fast. My melee has actually saved me more than I have ever used self-res. I guess for me it depends on what the mission calls for.