A lot of people go over the top with servo's, 20 odd years ago we never had or could afford big servos, I have a 20yr old 1/4 scale aeronca champ that still fly's on its old std Futaba servos !

My Stearman which has over 100 flights has 2 x spek DS821 for the ailerons, JR591 on rudder and throttle and Hitec 5625 on elev.