The main difference between 2 stroke and 4 stroke engines when comparing them side by side with cubic inch size is 2 strokes are generally less cost, more powerful, fewer moving parts, more crash damage resistant, lighter, better selection of sizes to fit more models........

4 stroke model engines are engineering marvels, most brands and sizes can be matched up with a corresponding airframe to deliver either stupendous or "scale like" performance....whatever you want.