When I tried to figure out the popularity of AT3's heroines, then according from the pics count (at this time) are:
Saki = filament + salapator + sakia-rumei + herself = 54
Finnel = soma + yurishica + suzuno_miya + herself = 74

So Finnel is favorable amongst AT's fans?

It seems to be so, but after listening to her Hymnos Concert CD, I prefer Saki more myself.

I dunno, my 3 favorite songs from the game are Z, CUTYPUMP, and COSMOFLIPS, which are sung by Cocona, a boss, and the third Reyvateil respectively...
Of course they also happen to be on other characters' CDs :)