It sounds like Maytom has made up his mind, but since he asked about the LC9s Pro, I can offer my advice/experience with it.
The LC9 frame is FLAT AS A PANCAKE. The grip feels exactly how it looks - FLAT. A Hogue Handall will help, but also adds bulk for concealment. If you can get over that flat feeling, that's the only negative I would mention about the LC9.
The LC9 -->S<-- is a striker fired version, such that it has a trigger block blade style safety (think Glock) and is striker fired, as opposed to the original LC9 (no s) DAO hammer fired action. The LC9 trigger wasn't bad, just long, but the LC9s trigger is all the more better. The new LC9s's also eliminated the HORRIBLY UGLY loaded chamber indicator in the top of the slide of the original LC9.
The LC9s -->PRO<-- is basically a "trim package" for the LC9s. The only two differences are: 1) the Pro does not have a magazine disconnect, such that it can fire with the magazine removed, and 2) the Pro does not have a manual safety.
I personally don't have a Pro, but I do have an LC9 and an LC9s. I disabled the magazine disconnect on both, as well as modified the manual safety to reduce the size of the manual safety so that I can carry it with the safety OFF without worrying about it accidentally getting clicked ON. In other words, I converted my LC9 and LC9s to "Pro". The "S" didn't exist when I bought my LC9, and the "Pro" wasn't available when I got my "S". Either way - I have all of the upgrade features of the Pro in both of my LC9's.
I carry an LCP most often though. It's a size smaller in two dimensions, such that I can carry it without printing much more easily. The LCP ALSO doesn't have a magazine disconnect nor a manual safety, so it essentially operates like the Pro, but has a longer DAO trigger pull.
What's great about the upgrades in the Pro: You don't have to do anything between "oh $hit" and "Bang" except draw the pistol. Manual safeties are an extra and unnecessary step in the process.
So that's a long story for a short point - I'd recommend the LC9s Pro if you're looking at a 9mm concealed carry piece.
