Who's Better Marth or Lucina?

Marth relies on spacing, more defensive play, and early KOs. Lucina can be played more aggresively, and relies on her more effective combos to increase the damage enough so she can KO the opponent. Marth can be more rewarding if used right, but Lucina's consistent damage and knockback helps her in certain match-ups.

Why is Lucina so good?

Lucina is often looked at as a top tier due to her simplistic game plan, oppressive neutral and spacing game, strong edge guarding abilities, an excellent out of shield option and combo breaker in her up special, and fantastic forward smash. ... Essentially, Lucina is a character the excels because of her neutral game.

Is Marth's sword longer than Lucina's?

Marth does indeed have longer range than Lucina.