Which of those guns do you trust most for serious defensive use?Wow that's a "loaded" question! Really. If I'm carrying a revolver it depends why I'm carrying it. If I'm hunting I carry my 4" Taurus 357 except when hunting bear with my muzzleloader then I switch to my 4" Taurus .44 mag Tracker Lite.
But when I'm just hiking around I'm usually carrying my Taurus G2C 9mm. You see a trend here? Taurus was junk when they first came out but IMO they've become a very good reliable firearms manufacturer. I do have a S&W M&P40 that get some carry time too like when I'm up the cabin because of its capacity. Everyday carry almost always goes to my S&W M&P Shield 9mm because of its concealability.
I don't carry a revolver for everyday but it I did it would be a small Taurus 605 2" barrel and likely loaded with 38s.