The two BKPs I have experience with so far.
The Warpig is supposed to be the most compressed metal-style BKP. But you can always put a compressor in front of your amp anyway.
The Pig and Aftermath are quite different. The Aftermath is brighter, and has a hard crunch. It has a broad sounding, angry midrange with strong center mids; the Warpig is focused differently, and sounds "thicker." The Aftermath also sounds chimey, for really detailed sounding chords under high gain, which you may or may not want as much.
I can get a similar sound to what you're doing with my Aftermath though, with a little EQ'ing. It's just a question of what kind of feel you want out of your guitar; a choice between dry tightness, or thickness.