The loot pools seem very similar across the board; main thing I've noticed are:
Want WoE coin pouches, do a phobos orb.
Doing a deimos orb replaces WoE pouches with a low chance of abjurations (type by BC location), better crafting items, and L-tier Kupons.
Done a couple of Bia orbs (Mobline) and seen only stuff same as with deimos. May be better stuff in there (e.g HMP's) but I'd suspect they are low frequency drops on par or worse than Scarletite from deimos fights.
Its pretty predictable what you are likely to get.
For example in deimos orb fights each "scoring" mob drops a max of 6 items on death.
First slot is a monstrosity item or a low value event giveaway like redeyes.
Second slot seems to be almost invariable a kupon S,
Next two slots are spell scrolls, (usually AM, Utsu Ni, Phalanx, R3, Indi-Mal, etc) rare chance on these looks like meteor or arise.
Next slot is a crafting item, which can be anything from a kitron to a scarletite ingot.
Final slot is always a +2 AF3 item, which may vary by zone.