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The Mamba is designed to be one thing above all -- crazy understable. This helps achieve different things for different throwers. Newer players or those with average to low arm-speed (your ability to whip the disc) will find that this super fast driver stays straighter for longer. For more experienced throwers, the Mamba will be great for rollers, tailwind bombs, and a range of turnover shots. The notably shallow rim of the Mamba makes it especially suited to those with smaller hands.
Innova GStar is a unique blend of Star with added flexibility and grip. The plastic is great for cold weather or rainy days where the extra grip can save you some strokes.