For technique, I shoot my revolver, single action.
I have a double action 3rd gen because my family isn't as meticulous as I am about knowing exactly how a semi auto works. Besides, I like it. I wouldn't mind having a single action semi auto, but unfortunately I can't have everything.
BTW mine is a 5943. There is no 'manual of arms, or decockers/safeties. Put in the mag, rack and shoot. Good weight for a carry gun with the aluminum frame.