Different engines (Falcon is Kerosene, Starship is Methane), fully reusable (even the upper "orbital" stage), bigger and simpler (Elon said a while back that de

Different engines (Falcon is Kerosene, Starship is Methane), fully reusable (even the upper "orbital" stage), bigger and simpler (Elon said a while back that designing Falson Heavy (1 upper stage, 3x lower stage) was pretty much as difficult as designing a whole new rocket) and therefore better (in rockets, the bigger the rocket, the better - as the ratio between "framework" (computers, engines, metal exterior) and "fuel+payload" goes down so you can lift more).