I've only used the Nova bomb and quite like it. I've always been concerned that a boss can teleport away from the slow version, but I suppose I should give it a chance and see for myself... I run all 3 classes of guardians and the Voidwalker is by far my favorite!
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The slow one actually tracks and was buffed to be faster on initial casting for longer before it slows down. [i]~Nyahh! =^,.,^=[/i]