Board Thread:Questions and Answers/@comment-26558885-20150902065429/@comment-24152851-20150904040538

HighBreed are far more powerful, intelligent, dangerous, and with a clear goal. If it weren't for Ben saving them using the Omnitrix to rewrite their DNA, they would've wiped out all life in the Universe.

The Incurseans are too impulsive and reckless, so are much more incompetent. Attea is the only one who's particularly dangerous and intelligent. Back in AF and "So long and thanks for the Smoothies", Ben was able to beat them quite easily.

Also, Highbreed technology and physical powers are far superior. A Highbreed can take on Humungousaur, while an Incurseon could get beaten by Ben's normal form. Highbreed's also went to the trouble of DNAlien technology and infiltration, while Incurseons just go "BOOM BOOM" and blow everything up.

The only reason the Highbreed stopped is because they're smarter and saw the error of their ways, while the battle hungry Incurseons don't know when to quit.