Hard for me to say, I’ve only experienced hunter 3 falconer.
Multishot is great with circling thats a sure one, but that’s an archer skills.
Anything with AoE attack ratio benefits from circling,
Hovering is not reliable.
sonic strike doesn’t deal high damage on that high cooldown (fixed on the auto attacking with preemtive strike, so it would be additional damage on the side)
Pheasant is an AoE knock down, Dunno how good its damage is beyond level 1 though.
To be honest falconer seems like could be used by anything from prior circles and benefit anything from circle nine onwards.
~my speculation~
Why it would benefit anything from rank 1~5? well circling will have that attribute that has 75% chance to replicate any physical attack that was dealt inside its area of effects so anything could benefit from it. I had an argument with awoo on this, as there’s little proof of this beign as I’ve described it, so take it as a grain of salt.
@Awoooo said something about archers missiles not beign truly physical, but as I’ve said there’s little proof of this, must be because that attribute is kind of expensive. 25.5 millions to upgrade.
So. choose whatever you’d like to combine with falconer.