The UG has a much nicer-looking display than the SG II does. The SG is more configurable, and if you know what you're doing you can add more readout choices than originally are programmed into it.
The MINI boards have stories about the UG causing the car's electronics to come back on-line after the car is shut down, draining the battery overnight. No such stories about the SG II.
I have the SG II, and I like it. It displays four readouts at once, and I can choose what to show.
-soD
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