Luna, she works in the darkness and does it all alone. She has been shunned a lot in her lifetime. She went through more pain than Celestia. The only pain Celestia has to go through was having to banish her own sister and YES that is horrible and heart wrenching also very sad to HAVE to do that to your own sister but try to look at the facts. Luna was in even more pain that she went so crazy as to attack her own sister because she was shunned by her and the rest of Equestria. Celestia might have not known she was doing so but she didn't pay much head to her sister emotions. Luna felt so incredibly upset that she went crazy attacked Celestia and the rest of Equestria for being shunned for 1000's of years after seeing Celestia in the "spotlight" for so long. Celestia may have a tough job working around places all day but she gets to interact with others and feel happy during the day time while every body opens up to her more and talks about her more and Luna has to work alone in the dark battling nightmares fighting constantly and she doesn't have any pony there for her in her dreams. and she makes the night because night time is the time of day to relax and be at peace and to prepare FOR the daytime and it duties ahead yet they didn't appreciate that. I hold more respect for Luna sorry. so Luna