L-Roy: I'm with Dave in WV. I will practice single action shooting with my 357 and 44 magnums, but go with double action practice with my 38 snubbie carry gun.
Sometimes, just sometimes, I will double action one of the larger ones to see if I can keep it in the breadbasket at hunting ranges out to 50 yds, but it is a slow and easy trigger pull. With the carry gun I will plat the front sight where I want the bullet to hit and shoot double taps at double action until I am comfortable with how I'm shooting.
As regards a DA/SA vs DAO revolver, I feel the DA/SA is smoother and I'm more comfortable, and more accurate with that style trigger. Mikey.