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Mac Mouse Fix is by far the best 3rd-party driver in my experience, it just doesn't work as well with the MX Master 3 specifically since the input of that scroll wheel is kind of strange and is best handled by Logitech's software. The scrolling with MMF is actually as smooth as it is with the first-party accessories, unlike Mos which is better than the default behavior but doesn't quite get all the way there.

But who wants to deal with Logitech's software? Personally I've been using the Razer Pro Click with Mac Mouse Fix for years now and it feels like the perfect companion to the Magic Keyboard. Mac Mouse Fix also provides better support for using your mouse buttons to emulate trackpad gestures.
 
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If nobody has recommended it yet, I really love this app called BetterMouse. I think it's $5 for lifetime access. Gives you complete customization of absolutely every aspect of the mouse.

You can set the scroll speed, acceleration, etc. Map all the buttons. All of what you'd expect.
 
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