It all depends on the person. What are you comfortable with, what do you shoot best with, and what is your experience with the different platforms?
If your going to carry a pistol that has a safety/decocker and leave the gun in double action mode and the safety on, I guess you could say that your being redundant on the safety issue. Some might say the best of both worlds, and possibly the most safe.
There is also the platform of a double action only trigger without any external safety. They are built into the trigger like Glocks and XD's and even the DA revolvers. Lots of folks out there that think these are sufficient safety measures. No forgetting to remove the safety when in a situation of stress.
And as you have said the 1911 platform or others that have a single action trigger pull with external safeties of some sort. The 1911's have the grip and the external safety, sort of a redundant system but different than the first ones mentioned.
All of the platforms have safety features built into them. None of them, assuming that they are from reputable manufactures are going to go boom if you don't put your booger hook on the trigger and pull it. None of the platforms are necessarily better, or safer than any of the other ones.
Some of the platforms require that you take an extra step before your gun is in a mode that will allow you to defend yourself. If this step is forgotten your run the risk of pulling very hard on the trigger only to have nothing happen. This could cost you your life. Hopefully not.
There is no right answer on this one for everyone. It boils down to your personal preference and your personal experience with firearms, especially the one you choose to carry. My wife has choosen a Glock because she doesn't want any safety or anything to think about if she ever has to use her gun. I prefer my 1911 cocked and locked, or either of my two Taurus pistols with single action triggers and the safety on. What is right for her isn't necessarily right for me or vice versa. That is why there are so many different manufactures and so many different options in trigger actions and safeties.
I know this didn't really answer your question, but there really isn't a single answer to the question in my opinion.