Yeah, I should have made the OP more constructive. I will agree with Falch and say the sword one is nice, especially because you can throw the enemy up in the air and slam them down.100% subjective. The best is your favourite.
My favourite is the cutter. Great mid ranged weapon and combos very well at close range. It's only downside is it's not long ranged, but realistically, there's little need for very long ranged abilities in any Kirby game.