The only 9mm I have is a P938. So that is my vote. It was my valentines present from my wife last year and gets carried more than my .45s lately. Shhh don't tell anybody.
+1 this or P239, +2 P239SAS for carry.Sig P6/225
I've handled and shot all of the guns I listed and to me the most accurate and comfortable to shoot was the Nano, kind of surprising.