You won't notice the difference by looking, they are near identical.
But as Old No 7 so eloquently stated, you'll sure notice it when you pull the trigger.
I like the 40 round, it's good and often available when everything else gets scooped off the shelf, but not in a compact size gun.
I have a K40 magna ported and it still has a ton of flip every shot.
I'd get the 9. Actually I did.
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."