Went with the Gen4. Really like the thinner grip and larger magazine release button. I did find that the Gen4 had a somewhat heavier trigger pull. According to Glock, if I recall correctly, it's about 1lb heavier than the Gen3. Added a Ghost 5lb Tactical Connector and Lightning Strike Firing Pin Safety Plunger and it improved the trigger tremendously. I own a few Gen2 and Gen3 Glocks, and my Gen4 G26 has the best trigger of the bunch. Great gun!