Well, I own blades from both the Busse main line and Swamp Rat. I am not a total hog and rat fanatic, but I do recognize quality. I have knives from a number of other sources as well, of varying quality and function.
There's not that much separating Busse and Swamp Rat. Style wise you will see a lot of similarities. The steel in both are superior, but the INFI material is a proprietary alloy that has some very desirable qualities as a knife steel. Given current technology, I doubt there's much that could be done to improve the metallurgical quality of any knife material beyond what Busse has done with INFI. I also believe that you won't find a better product guarantee/warranty than what you will find with either Busse or Swamp Rat.
Pick either brand and you will be quite satisfied with the purchase. A true value for money prospect.