Scott's indeed has more features..slow and hi speed circuits plus an adjustable arc of damping. Seeing as it sits in front of your face, you can adjust it 'on the fly'.
The WER has a single damping circuit, is adjustable...but not too well 'on the fly' as it's sitting just above your front fender.
The scotts has a problem with soft bushings in handlebars as the kdx has. Consider how often your bars look tweaked after an unscheduled landing, and that is just the bushings, NOT the bars. That 'tweak' can give the scotts fits. Their install sheet caution that the damper may be damaged in such an instance. You can replace the oem bushings with either a high durometer urethane type (scotts has 'em.....or used to) or aluminum cones. Obviously, the metal replacements detract from the 'isolation' function! ;)
The WER, mounting further down the forks, will 'resolve' the impact along less length of fork......so theoretically should do better in that regard. I've ridden bikes with a scotts, I have a WER. I've NOT ridden the SAME bike outfitted both ways, so can't directly compare.
With the WER, if you have it adjusted tight enough to be able to feel it, you have it adjusted too tight! That's not quite so with the scotts due to the two speed circuits. You may be able to 'feel' it when you move the bars back and forth, but that doesn't translate to actual riding.
The 'adjust on the fly' part is cute, but after awhile most riders tend to pretty much leave it alone. I've adjusted my WER on the fly..but it's not something you'll want to do in a technical section of trail...probably.
The scotts REQUIRES a specified distance between the crossbar and the bracket. 60mm comes to mind..please do verify that. Scotts sells renthals with a bowed crossbar for fit. No, they don't sell the crossbar separately.
My renthals (without the bowed crossbar) measured at exactly the specified space. A bit too close for comfort when you're buying such a spendy unit.
Oh...there's another thread on this forum about a rider that has a problem with the scotts on a kdx. The arc of the scotts is LESS than the steering arc on his kdx. Can't have that! And, he had trouble mounting the bolt on post so it didn't move.