I had the same dilemna for a couple of months.
I have carried my G-26 for many years, shot over 5000 rds in training, IDPA and GSSF competition.
I have practiced the draw over 10,000 times. This pistol is "part of me".
So, I was very reluctant to carry another gun.
However, in South Florida there are situations where even the baby Glock is too big for comfortable carry on my 5' 8" 140lbs frame.
After a long time debating, I decided to get a small gun.
Having a fairly large amount of 9mm ammo, and thinking that 9mm was the smallest SD round acceptable, I wanted a small 9mm gun.
Well, I didn't find any I liked, at least under $1000 ;D
None of the one I played with were much smaller than the G-26 and they didn't meet my criteria: no manual safety, and no magazine disconnect (not that I am against manual safeties, it is just that all my training was without)
So, I decided on the P3AT. It will be my EDC a few days a month and a BUG when I feel I need one. I read statistics showing the average distance in a street shooting was under 6 feet; what I call "bad breath range"

At that kind of distance, even a gun with almost no sights, and a smaller caliber should be "adequate"; people don't wear 4 layers of denim in South Florida.
For home defense, it is another story; one of the Glocks and my wife's .357 S&Ws are within reach all the time and will be used to access the 12 ga. Mossy ;D
That's
my story; however, we are all different and we have different needs.
Only
you can decide what is best for you.