I have experience with both, and although the "concealed" hammer (bodyguard) is very nice on single action the double is a bit stiff. not an issue hunting or at the range, but maybe an issue for ccw (I like the option to use sa but not likely to come up) so I checked some dao and they are not "lighter" BUT the cia/dao are a bit smoother and do not "stack" right before the trigger trips the hammer. a brand-new sample was easy to press through the cycle without my hand jiggling the sights off alignment, something I cannot do with most da revolvers. it's got to get smoother over time too, especially if recently oiled (you do oil your revolvers, don't you).
if I had money I'd go get a cia in .357 for a second snub, faster locktime, smoother da pull, doesn't get lint inside it gumming it up every couple weeks. put a houge grip on it, you're set.