Since there's a lot of active people in my guild, although they're individually weak, we're going with atk/double/burst/hp. When you have 10-15 people on each Burst Hour, Seeding their way through Ultimates, having that Burst bonus matters a lot.
Resource efficient? No. But group tactics.
Recovery seems like a strange option to me. Does everyone in your guild(s, as I see Sanahtlig used that as well) have Sol? Pretty much nobody has it over here, so it feels like a massive waste to invest in Andromeda and those few who have her, Brynhildr.