It's all about personal comfort (mental, not physical) and confidence.
I don't know what the knocks are on the fanny pack holster. I've had the same one made by Blackhawk for over a decade now and it works great (I also have a Serpa, so I have experience with that as well). It doesn't matter if you're in shorts, jeans, cold or hot weather. Unless you're going somewhere in a suit, it works. As for presentation, if you have a IWB holster cover by a tucked in shirt, it will take you just as long. I wear the fanny pack on my front right hip. I am willing to bet I can pull the tab and present just as quickly as most other holsters (I know there are people much faster than me, just making a generalized statement from my personal observations). If you are at the point of utilizing your sidearm, then being more or less obvious and deliberate are mute (this is not generalized, but experience from mulitple tours in Iraq).
I've also used my old style P220 for over the last decade. My wife knows how to use the pistol, but her eyes aren't as good as mine (which is probably why she married me!). A laser grip was a great decision for us. It allowed me quicker acquisition and more confident applications from different positions, and even more so for my wife.
If something is comforatable for you, and already works, then stick with it. I would recommend the laser as it will just enhance your confidence with what you are already comfortable using. Maybe it's just the military in me, but I'm all for not messing with what works for people, but adjusting to improve confidence when available. I'm not debating what's better or not, quicker or not, or anything else. Just advocating using the individuals area of confort to the best possible end.