To answer your question, yes I have in the past and changed and changed and changed again. For 20 years I used a Browning High Power, the main reason was the 13 round mag. So you could say I am very acquanted with the 9 mm. I have never been comfortable with the stopping power of 115 grain 9mm round, but felt that 3 or 4 rounds could be used to good advantage. 8 years ago I changed over to the 45 ACP (man gun) and tried that for a couple of years, even went out a bought a Kimber Eclipse Pro II which I loved and shot the best with. But after trying to carry a solid stainess steel pistol around all the time, the weight was just too much to be comfortable.
One of the problems with the 45 is the round count in the magazine, so to the store and a FNH FNP-40 was purchased, 14 +1 rounds in a poly framed stainless slide pistol. WELL, the 40 S&W is the worst of both worlds. Snappy recoil and a faster bullet to miss with, or at least not as accurate to hit with. (5 inch groups at 25 feet).
So now I decided to get an old favorite a CZ 75 P-01 good round count (14+1), fast recovery times, 124 grain 9mm +P, fantastic pistol grip, super reliable and easy to carry. (smaller size)
So now I should be happy, right? Well no, there is real world and what we think as real world. A) I am not a gun slinger and don't look for trouble. B) A 9mm on a druged up attacker will take 5 or more hits just to slow them down. C) I don't want to slow anyone down, just put them down to save my life or that of my family. D) faster is not better, more of the same is not better if it can't stop your problem.
What does work however is the 100 year old 45 ACP with a 230 grain hollow point bullet, maybe I will need two of them, but that's a lot better than standing there as a target unloading 5 or more 9mm rounds.
That's just my take on it. (stick to the 45 ACP)
Jim