What experience do you have with handguns? Carry something very familiar to what you shoot most so the muscle memory and deployment will be second nature. What type of trigger is best will always be personal opinion, especially for self defense. My personal opinion is a good dao or da/sa with no safety engaged is the best way to go. That way you don't have to worry about disengaging a safety in a stressful situation and when the gun goes boom you surely wanted to fire it. I would not recommend carrying a 1911 cocked and unlocked, to me trigger is too light. Although with enough practice any gun you want to carry should be safe and efficient.