Just a point of terminology here, as there seems to be a bit of confusion - there are 4 types of revolver hammers, and two of them are being confused in this thread:
Exposed hammers = 2 types, conventional spurred DA/SA and spurless or bobbed DAO --> think about the SP101 models, some DA/SA, some DAO
Internal DAO hammers = exactly as the name implies, the hammer is internal --> think LCR or 642
Shrouded DA/SA hammers = exposed hammer with "shrouds" on each side, partially concealing the hammer but allowing it to be thumbed for SA fire --> S&W 638
Folks confuse themselves and call INTERNAL hammer models "shrouded," but they're not. They're internal.
For a dedicated carry revolver, I do favor shrouded hammers, I like the idea of being able to thumb the hammer during load development, but LOVE the idea of having a snag-proof revolver, especially one which could be fired inside a pocket or bag or in contact with other fabric without risk of catching or pinching. Just aren't enough of them out there these days, so more often I settle for an internal hammer, or a DA/SA spurred gig.
I prefer no hammer on my carry revolvers.
That's a new one on me, what makes it go bang?