In my opinion, the Advar is more technical and resolving. I just did an A/B compare using Final E tips for both IEMs and Roon ARC via my humble iFi Go Blu.
Test tracks:
David J - “Man Of Influential Taste.”
There is snapping of fingers near the beginning of the track. Neither IEMs resolve them well (in comparison with full range speakers…where you can hear his fingers slip and fail in some snaps!) but when the organ and drums come in, the Advar immediately brings this to life. The Alba keeps the entire soundstage at arms length in a reserved and polite way. There is a touch of sibilance to David’s voice on the Advar that is absent on the Alba.
Miranda Lee Richards - “First Light of Winter.”
At 0:08, there is a tone change that even full range speakers can have a difficult time with, and I think the Alba reveals it a touch clearer than the Advar, but soon after that the mix fades in the vocal track so a sense of “air” really hovers before she sings, and perhaps the Advar is better at this. Again, the Alba keeps the track at arms length.
Flanger - “Galak”
This track is all about the vibraphone! The Advar allows it to ring and reverberate better around the bongos. No question in my opinion, but the arms length of the Albas lets you analyze it more.
Estas Tonne - Bird’s Teardrop (live)
Nice acoustic guitar and female voice. It gets busy toward the end of the track and while I think the track is compressed (my wife just shared it with me this afternoon so haven’t heard it on the main stereo yet!), the Advars handle the cacophony better where the feet stomping, etc. is more defined.
I hope this helps.