Hi I know this is a relatively old thread. And sorry that this came out to be a long response.
For the record I did not get my raptor yet, I have a 05 Scrow with a Icone 2.5 Front, 2.0 Rear, and TC upper arms. And it rides and handles much better than my brothers 2014 FX4.
I know a shop hear that belts a lot of varies vehicles (Trophy Trucks, Rally Trucks …). He did build a few Raptors.
He did the Icon King Fox & his own Fox Tune. From the feedback of the owners and his own:
1) Kings is better than OEM but not the best.
2) I cone are hard on road but shines when posed hared off road.
3) Fox is better on road but not as composed as Icon at high speeds.
4) Fox with his own tune, Still good on road and as good as Icon off road.
Please note that this is as pear others input, and the only person to have sampled them all is the owner of the shop and the people how work for him. But he is a strait forward man. He sell Fox, Icon, King, & Radflo. So he is not byes to any brand because he sell all of them, he will recommend to you what is suitable to your driving style. I have seen him trying to convince customers out of over doing thing because it is too much for their driving style (EX. Going with linked rears with 2 shocks pear corner with bump stops …).
When I get my raptor, and it is time to upgrade the shocks, I am going with Fox with the custom tune and TC Upper & lower front control arms. I like the Fox because they are bypass.
Hope this helps.
PS: The custom tune is for desert terrain, That is the dominating terrain hear in the UAE.