The biggest question when it comes to level 51 is: Where distribute stat points?
Below is a list of what each type of status provides you with:
Strength increases:
• Physical damage (who strikes up close)
• Rate of double attack
• Damage to critical attacks
• Damage to physical piercing. (EPIC-EXODUS II)
Agility increases:
• Physical damage (who strikes from afar)
• The level of critical
• Rate of mark (hit)
• Avoidance / Evasion
Intelligence increases:
• Magic Attack
• Level of Healing
• Decrease cooling time (EPIC II EXODUS)
• Damage piercing magic (EPIC II EXODUS)
Constitution increases:
• Max HP
• Regeneration of HP
• Resistance to attacks critics
• Ability to attack (EPIC II EXODUS)
Luck increases:
• Maximum MP
• Regeneration of MP
• Resistance to abnormal status
Knowing what you will receive with each type of status, will be easier to distribute the points later.
I hope this helps.