Personally, I will not carry a pistol with a manual safety. I learned to shoot a pistol with a revolver, so no manual safety was what I learned. The semi-autos I have and have had over the years have all been no safety / decocker only. Last year I was considering getting a 1911 and rented one. The range did not allow drawing from a holster, but I tried quickly picking it up from the bench, disengaging the safety and double tapping. 4/10 times I did not get the safety off, either because I fumbled it or just completely forgot (and this was at a range, THINKING about disengaging the safety). I realized that my muscle memory is for a non-safety pistol and without some serious re-training I would never feel comfortable carrying a 1911.
I currently carry a S&W 642 and/or a Beretta 92G. On the Beretta G models, the decocker lever (that is also a safety on the F models) has a spring that returns it to the fire position. I have seen someone accidentally engage the safety on a 92FS when racking the slide during a reload. If/when I get another carry pistol, it will not have a thumb safety.
I currently carry a S&W 642 and/or a Beretta 92G. On the Beretta G models, the decocker lever (that is also a safety on the F models) has a spring that returns it to the fire position. I have seen someone accidentally engage the safety on a 92FS when racking the slide during a reload. If/when I get another carry pistol, it will not have a thumb safety.