Question

What's the best weapon for knights under level 30?

Comments

Edit: I withdraw the answer, apologies, misread the question.

Answer 1

It all depends on your skills, if you have high I prefer to use two-handed weapons, if they are low then one-handed.
 

Axes:
Knight Axe (Atk:33, Def:21 +1) minimum 25 lvl
Naginata (Atk:39, Def:25) two-handed minimum 25 lvl
 

Swords:
Cowtana(Atk:34, Def:19 +1 def) min 25 lvl
Crystal Sword(Atk:35, Def:26) two-handed min 25 lvl
 

Clubs:
Diamond Sceptre(Atk:34, Def:18) min 25 lvl
Brutetamer's staff (Atk:35, Def:15) two-handed min 25 lvl

Answer 2

according to statistics weapons from Daissy's reply, but my favourite always Serpent Sword [ATK: 18, DEF: 15+1 + 8% earth] <3