If the size of the Gen 3's grip is just fine for you, I say go with whichever grip texture you prefer. But keep in mind that the larger magazine release on the Gen 4 isn't necessarily an improvement. Sure, it's nice that it's easily reversible, but its larger size increases the chance that it will be accidentally pressed when carrying in a soft holster such as a belly band or an ankle holster, effectively turning your Glock into a single-shot.
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0331: "Accuracy by volume."
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