I am facing the same dilemma as you, I need to pick between these 3 options. I also want to retain the functionality of the adaptive suspension. My M4 is my daily driver that I also use in winter, so ride height is a concern to me.
H&R provides an optimal drop in terms of looks, is inexpensive. I am concerned it is too low for winter driving.
Eibach less of a drop means less compromise for the winter, also inexpensive.
K&W HAS ability to adjust ride height (I can lower the car in the spring and raise it in the fall), ability to corner balance the car for optimal handling, more expensive option
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