My favorites are
1 Crimson Wetlands - Something about the waterfall with scarlet ibis and rosate spoonbill soaring through the air plus the flamingo flock feeding in the pond just strikes me.
2 Heart of Africa - Wow. This was amazing. The best part about it was wherever you looked, there were birds. The sky had storks, the canopy of the trees had ibises, the trees had starlings, and the ground had cranes, shoebills, and ducks.
3 Wings of Asia's Pond was great, and all the species inside was great overall. The forestry had a feeling that was just amazing to me.