What is the basic difference? Is the trigger pull crisper or is it just the trigger reset is more audible?

Reason asking is I was handling a used ( looked new) 9c today and the trigger felt better than my FS9. Less mushy. But the reset felt and sounded the same as my FS. Barely audible.

I then tried a new 9c and the trigger felt worse but very loud reset

Confused lol

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M&P 2.0 9mm-Shield9-Shield45

I don't think the actual break is any different, crisper, etc. The major difference is the reset is tactile, you can feel it. Sound has no benefit in an outdoor environment, and especially in shooting surroundings. But being able to feel the reset, and not guess if the trigger has reset, is important. On the older style triggers, you have to almost fully release the trigger, to be sure of reset. On the new trigger, you stop releasing when you feel the reset. The feel is the trigger jumps about 1/32 inch, at reset. This allows for faster, smoother follow up shots.

Bob