Embrace the void guardian. But for real, both classes are amazingly fun to use, people say self res is a crutch but they won't dare say it when you save their ass on a nightfall. Voidwalker obsidian mind+ bad juju has got to be some of the most fun I have had lately and I highly recommend it to everyone. It makes doing strikes so much easier as it clears enemies and rains orbs for your teammates. Also sunsinger can be an insane orb generator as well if you use a good build. In strikes other than nightfalls don't bother with self res and go with the increase damage resistance (forgot the name) and spam some nades for everyone