The OS-50SX is a LOT more powerful than the LA and noticeably stronger than the 46FX/AX- I would bet it'd get you out of a hover but not quickly enough [X(]

Stable, precise and capable of freaky 3D are almost opposites by nature- a properly set-up Funtana could be stable and precise, but to make it freaky 3D would mean WAY overpowering it , moving the CG pretty tail-heavy and cranking the throws as far as they go- All good things but this makes the airplane less-stable.
My Funtana-40 has a Supertigre G-90 2 cy. 15x4 prop. and I have 140% travel everywhere I can get it-

The UCD-46 is more stable than the Funtana "generally" because of the longer tail-moment (distance between the wing and tail-) but again it is the set-up as much as the design-

The best freaky 3D planes are profiles, because while ugly, they fly awesome!