You likely know this already (having done a search as bscottr recommended).....
Scott's is the most expensive method. Even requires new bars in most cases. Their 'complete' setup (with clamp) still retains the isolation bushings, which are noted as problems for the scotts damper.
The WER mounts lower. The less metal the deflection movement travels through (length of fork, clamp, handlebars etc) the better the damping action (imo). But the WER does NOT have multiple circuits (fast/slow) as the scotts has.
So, it's not a matter of 'best'. More a matter of your choice. Do some research. Make an informed decision that suits 'ya! Hopefully after it's on your bike, it'll STILL suit 'ya!
Generally, although some more some less, the consensus is that WHATever you choose, once you ride WITH one, you won't ever want to ride withOUT one.