I prefer the .380 over the nine.
I'll tell you my reason....the ability to control the weapon under stress and duress.
I can take my single action mustang and triple / quadriple tap accurately on one or more attackers, while I'll get myself killed using my Kahr CW9. You just can't squeeze off rounds as quick nor as accurate as the mustang, due to recoil and trigger type.
Yes, its an old argument but its sure fun to read what others say on the subject.
If your a fan of either round, Lets hear your point of view !