I have an LC9s that is my favorite carry gun. It's far more comfortable to shoot than my LCP and much more accurate, not to mention firing a more powerful round.
But I prefer to carry my LCP most of the time for two reasons. One, the slight difference in size makes a big difference in how comfortable it is to carry and how easy it is to conceal. I never have to worry about the LCP being seen by house guests who may or may not feel positively about gun ownership.
More importantly, I live in a densely populated urban area, and so I do worry about the potential for collateral damage. I have neighbors with kids and I feel confident that a stray .380 JHP couldn't penetrate two exterior walls and still have enough energy to kill someone. There are obviously those gun owners who believe that stray bullets should be a secondary concern, or that no one should own a gun if they can't put 100% of bullets on the target, but I disagree. I'm confident in my shooting, but I'm not so confident that I don't want some insurance in case I happen to miss.
In a high stress situation anyone is capable of missing and that's why I try to think about how I can shoot in such a way as to mitigate the risk to bystanders if I do happen to miss or hit the target in such a way that the bullet continues past with almost no energy loss.