Great question — answering as the UphillTech team:
The differences between the bikes are small, and mainly will relate to durability. The quality of several key components is higher on the Analog Disc, which should equal smoother, faster shifting and better longevity of these components. In addition the Analog Disc is a 9 speed bike, and the Aim Disc is an 8 speed bike. As the current high end models are 10 speed, and 8 speed mountain components are expected to go away in the next year or so, I would recommend the Analog Disc. They aren't showing pricing, but I wouldn't expect more than a 100-150 dollar or so difference between the 2 bikes. I hope that helps.
Full answer by zenbike: https://bicycles.stackexchange.com/a/8858 (CC BY-SA 3.0).
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