My vote is the PM9, for number 1 not number 2.
This is my opinion only. I have carried a R9 and a PM9. The R9 I owned had major reliability problems and the PM9 has been 100% reliable. I found the PM9 easier to shoot more accurately at a fast rate of fire. I think replacement grips and hooked extensions on the R9 would have probably brought the two closer together. I much prefer the conventional mag release and slide catch on the Kahr. With the "heel mag catch" I personaly do not think I would carry it as primary. The more I shot the PM9 the more I liked it.
My R9 weighed 18.0 oz. with 7 rounds of 115 gr ammo, the PM9 weighs 19.7 oz. Now that is 10% which is considerable, but I found it barely noticable in my pocket.
The reliability factor was probably what decided it for me. I decided on the PM9 instead of:
-Sending the R9 back to have the relibility issue fixed
-Spending money on replacement grips
-spending money on mag extensions or front strap checkering
I could have done all this and still prefered the PM9.
This is my opinion only! Gentlemen, carry what you are most comfortable with.