Get the LC9s Pro now before they're all backordered. I'm not a Ruger guy, but this gun is a homerun for me, when am cool carrying 9mm. It's now my EDC cause of size, smoothness, accuracy, trigger, and value. As far as the other four fav's I've carried, they're listed below (in order of my preference):
Sig P938 - Great little lightweight gun that was my go-to. Night sites a plus. Beaver tail bugged me a bit driving is it's only negative!
Sig 290RS- DAO that is fairly light but heavier than 938 w/Night sites and bigger mag extended cap/grip option.
Shield (I have .40 version) - slim and fairly light but larger/heavier than 938
Kahr CM9 (I have .40 version but I, personally, don't care for trigger so it got the boot) - It is biggest bang for size - slim and light - .40 version extremely snappy - way more than glock 27.