Anyone?
What is your current suspension spec?
Suspension tuning is a toughy to get right!
Personally i would try the 16mm 1st, because the 20mm could be too hard for the suspension you have and cause a very twitchy rear end in the wet! But if your running quite a brutal setup you could get away with the 20mm!
Suspension setup is really all about personal preference!
whiteline adjustable is the way to go ?