They have the same drops, though I think the 30AP one gives you one extra drop. Still, 20 AP is more efficient for everything except Rank points I think, and even that's only a very slight edge.
I run the 30 AP ones anyway, just because that way I need to bother less.It's a feature.
Normally, it would've come to us many months later, but we got it by accident in one of our pre-mature re-runs. That's why it still says "oh no you can't use this Eidolon since you're not friends!!!11" even though it isn't the case anymore. I assume that text will change when we get to the place the re-run should've taken.