When it comes to bullet performance, a longer barreled pistol will always provide for improved performance!The vast majority of the market seems to prefer short slide/full grip over full slide/short grip. While slide/barrel length may not effect concealment until you get in to the 6in range it can effect comfort for many before that point.
For close-quarters battle, there is an advantage to having/using a shorter barreled pistol...
Having a solid grip on one's pistol, at all times, matters...
To each their own...