You have to notice, they're a huge price difference in these two programs that seem to do the same thing. One is a total of 90 points, the other is 300. Do you have a preference? If so, why?
AU is A LOT more advanced than my ABer. That's why there's such a huge price gap. My ABer is just for simple, no-nonsense ABing. Of course, its probably more liable to icing since it doesn't (yet) have features like spidering, advance refresh rates, etc.