There's always something new coming out to challenge the G19. They have to prove the test of time which Glock has done for over 35 yrs. With that said, I would recommend the FN 509M as an alternative. Same size as the G19 and it has been perfect for me. The FN definitely has a good reputation. Another one that just came out but not Ma compliant yet is the Mossberg MC2. Also the same size as the G19 and if it is reliable should be a good one.