You shouldn't have any troubles with either of the CW's. Personally I'm a 45 guy but if it were me I'd get the CW9.
Small light gun, and more comfy to shoot. Many here love the 40 and I do too in a full size gun.
The break in isn't a for sure thing either, some run fine and dandy right out of the box. Others need a little love.
There's lots of good help here if you need it. I think you'll enjoy the CW.
In Memory of Paul "Dietrich" Stines.
Dad: Say something nice to your cousin Shirley
Dietrich: For a fat girl you sure don't sweat much.
Cue sound of Head slap.
RIP Muggsy & TMan
"If you are a warrior legally authorized to carry a weapon and you step outside without that weapon, then you become a sheep, pretending that JOCKO will not come today."