Dexterity to Accuracy and Light Weapon

How exactly does one Dexterity point translate to Accuracy and Light Weapon? I’m trying to decide between the Rogue Bow and the Robber Leader’s Bow. They both have identical stats except the Rogue Bow has a +5 Dexterity enchantment and the Robber Leader’s Bow has a +10 Accuracy enchantment. Which one’s better? Also, is it better to enchant an item with a higher amount of, say, Attack Magic, or a lesser amount of the mother attribute Intelligence? They will always have different amounts per enchant cap because it takes more storage space to enchant an item with Intelligence to a specific level than it does to enchant an item with Attack Magic to the same level.