Had regular old bilstein oem's on the halfton and I can say they were impressive, the truck always handled very well for a truck and the shocks no doubt had alot to do with it.
Only fox shox I have experience with are on sleds and some old dirtbikes, they are definently among the best...
I would say whatever you like the looks of...Bilstein and Fox both have solid reputation and a quality product throughout the entire lineup. Never heard complaints about any either, lots of praise.