Well....I'm no expert with these pistols. I did just shoot both pistols for the first time - LCP and PM9. I do have a lot of "time" spent behind shooting pistols though, I've been a firearms instrutor for 7 years, SWAT 8 years and an LEO for 15 - mostly Glocks, a few others like Berettas, HKs, and Sigs...all of which were full size 9mm, .40, and 45ACP service pistols. My only experience with anything compact were G27s/26s and small 5 shot .38 revolvers.
On that note....I didn't think the LCP was all that bad in the trigger department for being a DAO trigger with a hammer. I think practice makes perfect for any firearm...you get used to anything if you shoot it enough. Train, Train, and train more. Now I'm not saying the LCP deserves any awards for it's trigger...but for it's intended purpose...a SHTF extremely concealable little pistol for about $350 it does it's job. I was able to shoot more than effectively at 7 yards with it...only slightly less than my proficiency with the PM9...but more than acceptable...and I never shot one before.
The PM9 is definitely in a different "class" as a pistol. I found it better on the follow up shots - smoother "recoil follow through as we say" - I could shoot it faster per say and stay on target more effectively. Kahr has a "better" trigger..yes, and better sights...But, I usually point shoot for "combat"/"defensive" (SHTF immediate threat) inside of 7 yards anyways.
I wouldn't bash the LCP now that I have shot it.....It just serves more of a pocket pistol/hideout role and that's it....but it works. The LCP also shot flawlessly..no malfunctions and the LCP was brand new out of the box. As so...the PM9 only had about 100 rounds in it and it was flawless also with 147 grain Rem FMJ ammo.
FYI FWIW
I felt more "confident" with the PM9 and would not be afraid to take any shot with it that I would take with my G21SF. The LCP I wouldn't...at least yet...be comfortable outside 12 yards or so.