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I cant put my finger on exactly why i like the first one best. Perhaps it's because it has 3 colors. The 2 green + red makes a great palette.
Also i would probably lose the glass effect. A great logo doesn't need any extra effects. Sure add it later on website, but the logo itself shouldn't be dependent on it.
Also, from a psychological perspective why not boost the meter a little, so i get a positive forward feeling? Just a little, so its not in the middle. I think it would also add to the dynamic. It is usually whats is off that makes it interesting.
