Probably in terms of the FR graphs.
@PENG has posted on the forum his FR graphs of his system comparing Audyssey vs Dirac vs Anthem ARC. He concluded by posting comparison graphs that overall, Dirac produces the best FR, follow by Audyssey in 2nd place. Anthem ARC was last place.
But not everyone likes all room corrections in terms of subjective sound.
Some people hate all room corrections. Like
@TLS Guy.
Some people prefer Audyssey, some prefer Dirac, some prefer Trinnov, some prefer ARC, etc.
So it's possible that the
@famasfilms just preferred Audyssey over ARC.