Putter · Both Overstable
The Discraft Luna (3/3/0/+3) and Prodigy A3 (4/3/0/+3) are both putters, and they fly very similarly.
The A3 is the faster disc (speed 4 vs 3), needing a touch more arm speed, while the Luna comes up to speed at a lower power level. Both discs share the same stability rating, so they finish their flights very similarly. Estimated maximum distance is about 57 m for the Luna versus 64 m for the A3.
The two fly alike in shape, so it comes down to speed: pick the faster A3 if you have the arm to drive it, or the Luna for an easier, lower-power flight.
The A3 is the faster disc (speed 4 vs 3), needing a touch more arm speed, while the Luna comes up to speed at a lower power level. Both discs share the same stability rating, so they finish their flights very similarly.
Neither — both carry the same stability rating and finish their flights very similarly.