You can check the stats of your weapons and compare for yourself. Higher damage values tends to be better. But you also need to take in other factors. A weapon with +speed is better than one with -speed and can make up for a small difference in damage values. +defense can be helpful in keeping you alive, but each point only reduces the damage you take by 1 point. +weight knocks monsters further back and depending on your tactic it can be useful.
If you get a weapon with a star (marking enchantment) and + attack, each point there adds 3 to both values of your damage range.