Why not carry the 5906?
seriously, why not?
Now, it seems to me that while the G27 is somewhat smaller and lighter, just having a short barrel and abbreviated grips don't make a huge difference in how concealable it is, and with a fully loaded mag, it is still going to be heavy.
I'd suggest carrying the 5906, it is what you have shot the most so far, so you are already familiar with it.
Now, the 5906 is a full sized gun, but again, while the G27 is smaller, it is not 'tiny' and it seems to me most of the times taht a 5906 will truely be too big, the G27 may well be too big too. I'd suggest carrying the 5906 and having a second gun for CCW that is MUCH smaller, say a .32 beretta or something to cover those few times 5906 is too big.
Yes, lighter is easier for carry, but really, what should be your top priority when yiou carry? what is easiest or what is most effective?
Guys... the one shot stop thing isn't a myth. If you look at documented records of police shootings, i.e. occaisons in which officers shot perpetrators, you learn some interesting things. For shots in the torso, pretty much every caliber 9mm, .38SPL or better, with well designed hollowpoint defense ammunition, has a history of over 90% one shot stops.
This is exactly what most people are taking about, shot placement is the key...here it is a standard size catridge hitting the torso, and even then, it is only 90% effective
The famed 357 magnum using 125gr hollowpoints has what, a 97% one shot stop rate, so NOTHING is perfectly guarenteed to give one shot stops.
Plus, one must define 'one shot stops' Exactly how much time passes between bullet hitting and guy being dead or totally incapacitated? A guy charging forward with a knife getting shot may well still be able to stab you once or twice before succumbing to his own wounds