there are several considerations in a pistol trigger,
First is how hard do you have to pull the trigger and how far do you have to pull it until it reaches the break point.....where it breaks and the gun fires
Second is can you feel a definite break point, and is it a crisp clean break or do you have to pull through it wondering when the gun will go bang? you want a nice crisp definite break point.
Then there is the reset, how far must the trigger travel back to its starting point once it has been fired.
Can you then feel when the trigger has passed the reset point? if so can you easily return to the break point?
What you want in a trigger, is enough feedback so you can absolutely feel where the break point is, and you want that to be very clean and definite, no grinding, no spongy feeling, just a nice clean break
The best factory triggers are found on competition 22's like a Walther OSP or GSP
Duty triggers are different beasts altogether as they are usually used when the heart is racing an all fine motor skills are useless, only gross motor skills are available.
Some excellent triggers are found on competition Sigs, or CZ's they are very consistent all the way through and typically need very little work to be perfect.
Colt Pythons have likely the best trigger on any wheel gun, which is one of the reasons they are so desireable, a good smith can tune a S&W trigger and make them better than the python, often times much better, but they are no longer factory triggers.