Speak to any aerobatic pilot and they will say spin recovery is better with power ...
Not me, not generally. Not just the effects of slipstream and torque but also propeller gyroscopic moments which will be different depending on directions of rotation.
Australia's Civil Aviation Safety Authority's Flight Instructor Manual:
RECOVERY FROM A WING DROP AT THE STALL
“Use the standard recovery, i.e. simultaneous use of power and forward movement of the control column. In addition rudder must be used to prevent the nose of the aeroplane yawing into the direction of the lowered wing. The ailerons should be held neutral until control is regained, when the wings should be levelled.”
RECOVERY AT THE INCIPIENT SPIN STAGE
“….. before the spin develops fully you will be recovering by ensuring the throttle is closed and the controls are centralised followed by recovery from the ensuing unusual attitude.”