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Originally Posted by Painted
Let it also be known that a single action gun has a heavy, long trigger pull the first shot, however the rest of the shots have a very light and short trigger pull. Some may find this easier to shoot straight. (Actually I am not sure that all SA guns have the heavy trigger pull for the first shot, maybe someone could verify this)
A double action gun, on the other hand, has heavy and long trigger pulls for all shots.
I hope this makes sense to you, and gives a reason for the two kinds of actions.
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Painted, you're incorrect.
First of all, the question was specifically about SA vs. DA semi-auto pistols, not revolvers.
To be clear:
SA semi-auto (e.g. Colt 1911, Browning HP) - trigger pull is always relatively short/light. It's just that the hammer needs to be cocked for the first shot. When you rack the slide the hammer is cocked so you're ready to go. But if the hammer is "down" you can't even pull the trigger or fire - it has to be manually cocked. (Usually a SA auto is holstered with the hammer back and safety engaged - this is what's known as "cocked and locked") All trigger presses are relatively short/light.
DA/SA semi-auto (e.g. Sig Sauer P229, HK USP) - exactly the same as the SA semi-auto except that if the hammer is "down" you don't have to manually cock the hammer. In this case a single trigger press (DA) will cock the hammer then fire the gun. This is the relatively long/heavy trigger pull you were thinking about. If you don't like the heavy trigger pull of the DA you can still manually cock the hammer for the first shot.
SA revolver (e.g. Colt Peacemaker, Ruger Blackhawk) - you have to manually cock the hammer for each shot. If the hammer is down you can't even fire.
DA revolver (e.g. S&W M19, Colt Python) - Again, you don't have to manually cock the hammer to shoot. You can press the long/heavy DA trigger for the next shot.