sunday SP is >>>>>>>>>>>> everything for AP use. a lot of gem, rank point and xp.

1 hour 25AP weapon and eidolon enhance daily is > that if u can clear it.

besides that, there is 2 option for ur ap
1- farm raid boss for chance at SR weapons
2- farm story for rank points to get higher rank for more Soul P and more max AP. i think Aidoru found 5-4 as best rank point per AP.

it hard to decide because high rank means ur AP pots is more effective when event comes.