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From my experience SG is the winner. You can open the box and be running it in 2 minutes. It is time they released a SGIII though as it's starting to lag behind in some ways, especially for the price. But it works on most any car you might have.
UG doesn't work on my European cars or Diesels in general. Setting up all the pages will take you a while. The larger screen is neat, but might limit mounting options. It might take you a couple of weeks to go through all the settings to get it working correctly (only to give up in the end).
There's a big thread comparing the two on here already.
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