The bigger plane has more mass and is less "twitchy" on take off and landing. I have owned the Phoenix 40 size Decathlon (running a 46 2 stroke and a 51 4 stroke) and the Dyna Flite Decathlon with a G38 up front. The 40 size plane was more of a handful to fly. Both planes exhibited a remarkable ability to snap roll on command. The big wing is leisurely in rotation in a roll, but really comes around quickly in a snap roll.