Hi
As an audio - only app Auria is pretty hard to beat with the versions we have today. its ability to send recordings to another DAW via AAF , it’s very high quality plug ins , and automation put it to the front of the pack.
However Cubasis has MIDI … Which Auria lacks completely. This means lots of compositional possibilities using synths and the like. So for an over all complete package, Cubasis wins IMO.
Of course there’s updates on the horizon for Cubasis which could equalize things audio-wise … And there’s always rumors of Auria getting MIDI.
So yeah, get both!