I have a DAO (non-Sig) and I prefer it for CC..
1) Long trigger travel = much less chance of accidental discharge
2) IF I pull the trigger and there is NO bang, I can just pull the trigger again and double strike the same bullet.
With SAO, you have to slide the slide, eject the shell, all which takes time and make noise..
Now I may have to do that as well with my DAO, but I have a quick second chance for the bullet to go off.. IF it goes off, I've saved time and 1 round of ammo.. IF it doesn't go off, I've lost less than a second.. I know with good ammo this does not happen often, but it is possible.. And in a situation where you are actually firing at someone, I'd rather try NOT to have to clear the round..