I have both Gen4 and Gen3 pistols. The thing that I like most about the Gen 3's is that to me the trigger is lighter, and has a better feel. The grip of the Gen 4 does feel good, but I don't notice a real difference in grip while actually firing it. Another thing to consider is that you may wait sometime for a Gen 4 G20 to come out so I vote to get the tried and true Gen 3 G20SF. No sense in waiting when you can get an already GREAT pistol.