Honestly, they are both the same. The trigger in the 45 could be better. I went with the 19x for the improved trigger, the color and the sights. although I changed them for suppressor height sights. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-NxrHcV8CliM.html. great video. just subbed.