I'd have to see the Aperions in order to compare build quality. The only complaint I have about the Axioms is the possibility of damaging the vinyl on the corners if they are moved around a lot. This isn't a concern for most but if you plan on moving them from one place to another for auditions, expect some cosmetic damage. I would expect this to be the case for all vinyl-finished speakers.
As for the 1" HDF, this is not necessarily better. HDF is more dense than MDF and hence it has a higher resonant frequency. The ear is less sensitive to distortion at lower frequencies than higher.
Ultimately, graphs and listening tests are the best way to compare. Where are the graphs for the Aperions?
