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What're you trying to accomplish as far as ride? Since you have to tear apart the strut in both those applications the bilstein is the far better option.
Here's how those break down
The bilstein 5100 is a shock that will accept your factory coil, you dissaseble your factory coilover (strut- interchangeable terms) and rebuild it with the bilstein shock in the middle. You gain adjustable ride height but you've done a lot of work to just change the shock, the bilstein doesn't come with a spring installed, you put your factory spring in it. The ride height is changed by adjusting the preload, so the taller you go, the stiffer the ride gets. (Fox is adjusted the same way) essentially you're building a budget coilover kit similar to the fox offering. The fox is a drop in replacement with an application specific eibach spring installed. My brother is an engineer at fox so I've been to the factory and I love their stuff.
The rough country kit has a top plate spacer and a preload ring. You get about 1.5" lift from the top spacer on top of your strut and you end up with a stiffer ride because you have to break down the coilover and stuff a .5" preload spacer inside your factory coilovers to get the full 2" lift. Increasing preload makes the ride stiffer. In my opinion this is the worst option because it's requires all the work to half-ass the job. However, there is a better cheaper option than the rough country in my opinion. It's what I went with. Auto spring makes a 2" top plate spacer. no strut disassembly and no changing the preload, so your ride doesn't get stiffer (lord knows it already stiff enough) so you keep the factory ride, just taller. There is also quite a bit less involved with the installation since it just sits on top of the coilover, also makes them cheap because they're simple. Me, knowing I wanted 2" of lift and my fox coilovers were back ordered I just slapped those in the truck and I've been happy with them.
Here's how those break down
The bilstein 5100 is a shock that will accept your factory coil, you dissaseble your factory coilover (strut- interchangeable terms) and rebuild it with the bilstein shock in the middle. You gain adjustable ride height but you've done a lot of work to just change the shock, the bilstein doesn't come with a spring installed, you put your factory spring in it. The ride height is changed by adjusting the preload, so the taller you go, the stiffer the ride gets. (Fox is adjusted the same way) essentially you're building a budget coilover kit similar to the fox offering. The fox is a drop in replacement with an application specific eibach spring installed. My brother is an engineer at fox so I've been to the factory and I love their stuff.
The rough country kit has a top plate spacer and a preload ring. You get about 1.5" lift from the top spacer on top of your strut and you end up with a stiffer ride because you have to break down the coilover and stuff a .5" preload spacer inside your factory coilovers to get the full 2" lift. Increasing preload makes the ride stiffer. In my opinion this is the worst option because it's requires all the work to half-ass the job. However, there is a better cheaper option than the rough country in my opinion. It's what I went with. Auto spring makes a 2" top plate spacer. no strut disassembly and no changing the preload, so your ride doesn't get stiffer (lord knows it already stiff enough) so you keep the factory ride, just taller. There is also quite a bit less involved with the installation since it just sits on top of the coilover, also makes them cheap because they're simple. Me, knowing I wanted 2" of lift and my fox coilovers were back ordered I just slapped those in the truck and I've been happy with them.