DA only. The last few revolvers I've owned have been DAO, either from the factory or gunsmith modified at my request. Even when I had DA revolvers that could fire SA, I can't remember ever shooting them SA.

I must be odd, too (wouldn't be the first time I've been told that...). When I worked as an armed guard, I had to qualify with different handguns. I always got higher scores with my issued 4" S&W Model 10, factory stock except for grips, than my customized/accurized 1911. I have no scientific/factual basis for it, but I always thought it was the "rolling" of the DA trigger that helped me get more of a "surprise" break than the short, light SA trigger.