As someone who has listened to both the Andromeda and Solaris, I prefer the Andromeda. The Solaris has a scooped out upper mids that tend to sound odd tonally. As a result, the female vocals in the music I listen to, which is mainly Jpop and Kpop, do not sound right. The Andromeda has a nice sparkle in the treble that complements the vocals, but its bass is muddy. I do think that Solaris has the edge in detail and serparation however. All listening was done through a Sony WM1A or an iPhone and Apple Dong.
That being said, I brought some of my friends that own both Andromedas and Solaris to the audio store so they can listen to the Hidtion Viento-B. At a much cheaper price, they are wondering why people would even consider the Solaris and Andromeda. As a result, many of my kpop friends have flipped their Solaris and Andromedas and have bought custom Viento-B. Also, I prefer the IER-M9 to both of those IEMs. I think it sounds better, at least for my music tastes, but at that price point, the Viento-B is a much better buy. Hope this helps!