Eris

It's a habit, and it's quiet, I like quiet, and it's more efficient, no noise, no fuss, just a quick shot and you're done, it's cleaner, quieter, and more professional, and it makes it easier to get away with it

it makes the gun less powerful and everyone will still hear the gun

It's still powerful enough to kill, and the sound is muffled, it's not like you can hear a gunshot from a mile away, it's just a little quieter, and it's more accurate, it's a better shot, and it's less likely to miss, and it's easier to aim, and it's less likely to get caught, it's just a better option all around