IMO, with a modern firearm in good working order the difference between an AD and a ND is where the muzzle is pointed. If the muzzle is pointed in a safe direction it's an AD. If it's not pointed in a safe direction it's an ND. Point is that keeping the muzzle pointed in a safe direction is Job One. Follow that rule and even a malfunction won't cause any harm.

That said, the "safer" triggers probably do provide a slightly higher margin of safety. However, note the word slightly, they can be defeated by circumstance. Any object caught in the trigger that duplicates the size and shape of a finger can result in the gun discharging. It's the operator's responsibility to make sure that doesn't happen. Anytime you're holstering any handgun, it's important to take the time to make sure that the holster is clear of anything that could snag the trigger. Make that a habit and "Glock Leg" won't ever happen even if what you're carrying doesn't have any of these "safer" triggers.