The difference between the Cognito kit and the Camburg kit is the engineering, quality, and attention to detail behind it. The Cognito kit is designed to be an almost factory like part, that allows for a proper geometry when cranking up the torsion bars. However the Camburg kit is designed to correct the geometry as well as enhance the strength and extend the travel of the front end. If you look closely at the arms themselves the Camburgs have much nicer welds, plate gussets on top of the pivot/arm junction, 1.25" uniballs (larger than anyone else's arms at this time), and proper length high quality flush mount hardware to attach to the spindle. It is this type of attention to detail that you are paying for. We all know that larger tires + off road driving = dead ball joints. The uniballs will never need replacing (when taken care of properly) and can handle just about any tire you can squeeze in there unlike a standard ball joint. The Camburg arms are made of 4130 chromoly not just mild steel like the Cognitos. This makes for a stronger product as well. The Camburg arms are more capable of supporting larger tires in off road environments, and should you decide to upgrade the front end more at a later date (maybe 2.5" shocks and high angle CV's, upgraded tie rods) they will fully allow you to take advantage of those components. Camburg does also offer the tie rod upgrade which is pictured on the truck shown on the website. Calling them is best as they often offer products that don't show up on the website for some time.
Camburg properly sizes all of their hardware, which most companies do not. On high stress parts you will often hear people talk about shank length of bolts. What this means is that if you have two parts that you need to bolt together that total 3" in thickness, you would need a 3.5"-3.75" long bolt to have enough thread to get the nut on. However with conventional hardware the threads on a bolt of this size would be 1.5" long. That means the shank length would only be 2"-2.25" in length, not enough to have the strongest part of the hardware completely through and supporting the two parts. The solution to this is to buy hardware that is either too long for your application and then cut off the excess thread (leaving you with the full 3" of shank length) or to buy expensive properly sized hardware (Camburg does this). If I had a picture it would be much better than trying to explain it.
Once again, I wont say that the Cognitos are bad. If you just want to correct the geometry after cranking the torsion bars they will work just fine. People on this forum tend to load their vehicles heavily and drive many miles off road with oversize tires so for those reasons I think the Camburgs are a more fitting product. And no I don't have any affiliation with either brand.