Main difference: turn (Berg X 1 vs Groundhog 0). The Groundhog turns over more easily (better for less power or turnover shots); the Berg X resists turn and holds a hyzer.
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FAQ
Is the Berg X or Groundhog more overstable?
The Berg X is more overstable (stability +3 vs +2). It resists turning and fades harder.
Should a beginner pick the Berg X or Groundhog?
Both rate the same for beginners (51/100). Pick by feel and price.
What is the difference between the Berg X and Groundhog?
Main difference: turn (Berg X 1 vs Groundhog 0). The Groundhog turns over more easily (better for less power or turnover shots); the Berg X resists turn and holds a hyzer.