Elven Sight is much better than Ranger Sight, so I would not put anything into Ranger Sight unless you have lots of spare skill points you don't know what to do with.
Elven Sight (Passive)
You can see further and thus target and attack your enemies from afar.
Level 1 Increase sight range by 2. Required level 1
Level 2 Increase sight range by 4. Required level 5
Level 3 Increase sight range by 8. Required level 9
Level 4 Increase sight range by 10. Required level 13
Level 5 Increase sight range by 12. Required level 17
Ranger Sight (Passive)
Grants you the keen eyesight of a ranger to help you see your enemies from afar.
Level 1 Increase sight range by 1. Required level is 6
Level 2 Increase sight range by 1. Required level is 12
Level 3 Increase sight range by 1. Required level is 18
Level 4 Increase sight range by 1. Required level is 24
Level 5 Increase sight range by 1. Required level is 30
