The magneto motors are usually heavier and great for warbird applications where you need the nose weight. Electronic ignition motors are usually lighter and much more versatile for low and hi speed apps. The mag motors are usually set for one or the other. If you want hi end performance then the motors are a bear to start and vise versa. for price and performance in your app a G-26 or a Fuji 32 would work great.
Good Luck!