On paper the 40 has more power. However, the question is would the BG know the difference? I think not. Lets not get into a debate of the relative power ratings of each. Thats not what this is about.
Apparently the glock was causing some problems in operation which MAY effect your ability to place the first shot where it would do the job. If the KT (or any other 9) allows you to place the shot where its intended to go, its a better gun for YOU. What this is about is the best gun for YOU, not someone else.
A 9 in the upper chest is certainly better than a 40 in the stomach. Shot placement is the key. And, the KT PF9 is certainly no mouse gun, especially with todays high performance ammo.