From my experience, stay away from adjustable sway bars and use the H&R 50% stiffer than OEM M3 but same end links.
The Hotchkis, while adjustable, will end up on the 50% stiffer than stock. But the longer arm creates issues that will need unnecessary fiddling. Unless going to different tracks that need different front to rear stiffness balance, the adjustability is not adding anything.
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