As a longtime revolver and pistol shooter, and someone who carries a retirement weapon as a retired cop ...
If for general purpose CCW, and most easily carried for a wide range of daily activities and using a wide manner of dress/concealment ... the Shield.
If carried in the backwoods where the potential threats might include feral animals of medium size ... the Speed-Six.
There once was a time when I owned a pair of original Charter Arms Bulldog 3" snubs (stainless & carbon steel), and I really enjoyed shooting .44SPL (from my handloading and Ruger Blackhawk days). However, problems with both of the CA Bulldogs (the last one still had the same problem after it's 3rd trip back from the factory), and the lack (back then) of decent modern defensive JHP's that were suitable for those lightweight snubs, caused me to get rid of them.
Now, if this question were asked of me in one of the classes I used to teach, or the qual/training sessions I used to work as an instructor, I'd ask the person asking me this question ... Which of the 3 guns he/she were able to run the best - meaning the most controllably, and allowing
them the best consistent accuracy, under demanding drill conditions? If they're staking their lives on it (or the lives of loved ones), then they get to make their best informed choice and deal with any consequences.
Sure, I might offer my observations of what I'd observed while watching them being run through assorted courses-of-fire and drills, as I might see things they didn't realize were happening, or see things differently than they might have believed were occurring.
I remember one night during a class when a woman (CCW licensee) was qualifying with a medium frame S&W .38SPL and a compact pistol (I forget the make model). She was able to qualify with both, but then she asked another instructor and myself what we thought she should carry, between the two guns. Both of us looked at each other, and then at her, and pretty much simultaneously (without speaking to each other beforehand) said ... the revolver.
From their expressions, I could tell a couple of the other nearby shooters had expected us to say the double stack compact pistol she had with her. She, on the other hand, seemed relieved to hear our opinions about the revolver. We pointed out the results of both of her targets, which showed better results with the revolver, as well as her demonstrated apparent ease in handling and shooting the revolver (in DA). She said she felt better shooting the revolver, and had more confidence in using it. The targets justified her feeling. She said a close friend had recommended she buy the pistol for its better capacity, but she didn't like shooting it as much as the revolver.
Hits matter. Shooting means hitting. To the best of my knowledge, although she had both of the guns listed on her CCW, she planned to carry that S&W revolver.
Your guns. Your call. Your burden to choose.