As in the title

For me: I love From the Heavens (O12s, part 2)
why? the opening is fantastic with the transition from drum to voice to the string being beautifully timed with the opening of omega's completed experiment

The rest of the song I find hits the perfect mix between oh shit and a heroic reprise of several HW/ARR themes, fitting how its the catalyst for a lot of the conflict by driving the allagans to new heights and how the WOL finally ending this calamity level threat

Least favourite: Shiva's phase 3 theme in unreal/arr or the shb battle theme
why? They feel seriously out of place to me. The former feels more like a cringey anime song and the latter seems better suited to a concert than an overworld battle