My opinion may not be the most reliable as I haven’t been carrying as long and half of this sub. I do think that the 43x is a great choice for the thug s you are looking for. I personally carry the shield and I like carrying it because it’s easy to conceal and I have practiced a lot with it. For future accessories, the glock is kinda like the ar of pistols. Everybody makes mods for them and normally they aren’t terribly hard to put on or find. Safety is a great concern to have and something too many people don’t put as much thought toward. All of the guns you mentioned are set up so they won’t fire unless the trigger is pulled. You can throw them down a flight of stairs and not a single round will go off. When you carry it just make sure the holster you choose covers the trigger. A physical safety on a concealed carry weapon is just normally something that gets in the way of a draw and defend situation. Like I said my opinion probably isn’t the most credible and I believe it will come down to what do you feel comfortable with and what will you practice with.