I'm not a cop but I would not want my adrenaline-laced finger on a 3lb trigger when I had a 8-12 lb one available. Too much chance for an accidental discharge.

So, for me, a double action revolver would be kept with hammer down. a 1911 would be kept with the safety on (that makes the 1911 a poor choice for me. The time getting that safety off might be costly). A Glock or something similar would be just like the DA revolver.

But I would not want to be pointing a pistol with a light trigger at unknown targets.