[MotoSook]

DAO is not as nice when target practicing, but necessary for very compact design. The SA trigger pull is shorter and keeps you on target more easily that having to stroke the trigger to cock the hammer then releasing it. DA/SA is a good IMO... I wouldn't worry about a decocker too much. After you own a pistol for a while you'll be able to decock it more comfortably with your finger. The decocker is just more parts. It may be just me but it doesn't inspire confidence in me to decock with a decocker. So a compact DA/SA may be what you want if you only have one pistol. I think a lot of guys have a deep conceal (subcompact) and a full size pistol at minimum.

Edit - Sort of Ans to the Q - My opinion on carry piece - lightest pistol that is most comfortable (not too small) in one's hand. Mouse guns are too small for my hands ( I don't want to be fumbling with it when I need it most), but could be a great 2nd or 3rd goto in an ankle holster. For IWB carry...I don't think it has to be so small that one has to be able to hide it in the front pocket of ones jeans. Light is the most critical factor IMO...if it's too heavy it won't be comfortable..and you'll most likely not carry it. Some may not seem heavy when handling it....but try walking around with it for a couple of hours straight and a 25 oz pistol may seem pretty heavy. of course with light comes compact...