Will make little difference in how well you fly your airplane. The proper diameter and pitch for the engine in question and the intended aplication , ie. high wing scale vs low wing aerobatics are more pertinent than weather its an APC or Masterairscrew. I prefere and have had good results with Masterairscrew props on 4 cycle engines in scale aplications for the last 12 years. On the otherhand APC props on 2 cycles never failed me either.