Big recoil difference
IMO.......
The G27 snaps very violently. The G26 recoils softly IMO. The accuracy is similar (both have good accuracy). The G26 IME has a slight advantage in reliability. If you can contol the G27, get it. If not, get the G26 or G30 (even the G30 is much easier to shoot than the G27 IMO)!