Is it worth farming for the mats, though, or do you get better return for time/APs from daily quests?

I'm getting an Otogi stone every 4 runs on a top difficulty (30aps) daily quest, roughly, and about 5 S stones on the easiest (10aps). That's definitely better rates for S stones. Can you farm the mats for an Otogi stone in 15 runs on the Lake event? It's over 100 axes required, so I think it's about evens in AP cost, but takes more time. So yeah, I'm just taking the premium tickets and the Hermes from this one.