With very few exceptions, the trigger stroke on DAO and, to a lesser degree, striker fired pistols is longer than that of a SAO pistol. DAO pistols require a rather long trigger pull so "accidently" pulling the trigger is more difficult even if the pull weight required is the same. Since striker fired guns have somewhat shorter trigger strokes they usually have a safety built into the trigger to ensure it only moves when pulled by the trigger finger.
The only true safety is the shooter...keep your finger off the trigger unless you intend to fire.
IDPA Member A00640
Founding Charter Member - Middle Tennessee Shooter's Club