Many people have liked Renai Shashin as Ai's ballad single of 2006 just like Planetarium was Ai's ballad single in 2005.
So in terms of the song only, which is better?
Also, it would be good if you guys refrain from choosing the 3rd option!
I think there's been enough time for people to listen to Renai Shashin to decide....
As for me, I will give Planetarium a vote. I love that song since the first day that I listened! And today is always one of my favourite songs.