Sharing a comparison with Andromeda I did via pm yesterday.
I think Oriolus is slightly warm due to the midbass bloom, while maintaining good air, smoothness and clarity for the mids and treble. It's open and spacious and makes for a great relaxing listen. It's more laid back compared to Andromeda.
As for the Andromeda, it's a different presentation. It's more neutral and immediate, and has a very 'live' feel... You feel like you're in the studio with the artists. Bass is quick and goes deep with a slight midbass bump, but decays faster than Oriolus, definitely BA-sounding. Mids are tuned more for clarity rather than sweetness, male and female vocals sound clearer and more energetic than Oriolus. Treble is clear, sparkly and not harsh, very good balance between smoothness and detail. Stage-wise, it's a bit smaller than Oriolus because of the energy, but separation and air is very good bcos of the faster, thinner notes.
As to what I think, Andromeda is the better all-rounder because it's more neutral and fits nearly all genres. Oriolus is a more romantic listen, excellent for vocals and slower music, but not fast enough for hard rock and metal. They are both at the same tier, and both are excellent choices.