Eddie,
While I cannot claim to have any other line of Axanthics other than VPI, I can say that of the 4 adult female VPI Axanthics and 2 adult male VPI Axanthics that I have, there is quite a bit of variability. So, I personally would not claim that adult Axanthics are all that differnet. I have also seen a few very nicely colored adult TSK Axanthics.
Now if we are not talking definitives, and are making generalizations, then I agree, VPI Axanthics are typically better looking adults.