Here are the spanner wrenches for adjusting the Fox coil-overs:
Here is a good shot of the top of the coil-over showing the adjustment rings:
And here is a Fox 2.5 coil-over on a tacoma application:
Ignore the numbers .. I grabbed this photo off of google images quickly. But you can see that unlike the Bilsteins, the Fox coil-overs offer nearly infinite adjustment .Not only up and down, but in relation to each other .. if your truck was heavier on one side , you could tweak that coil-over so it lifted the truck on only that side by a fraction of an inch. Bilsteins offer a small handful of adustments only.
And you could tweak the Fox's on the fly, whereas you'd have to remove the Bilsteins to make an adjustment.
Also my Fox coil-overs are entirely rebuild-able. I could change out the oil for a different weight, or the coil, or the valving etc etc. LOT's of custom potential, as well as the simple ability to overhaul the equipment instead of shelling out thousands to get all new shocks.