Who do you like better? I know they are the same person, but both are different labels. The rest should be self explanatory. If you don't know the difference, you aren't a true fan lol.

Like a lot of people, I like Utada Hikaru better. Utada is okay, but it's only a completely different person outside of Japan. When in Japan, Utada Hikaru is super popular, everyone knows her, and is super excited to see. When in the US, it feels like Utada is a nobody compared to a lot of other people. It feels like when debuted in the US, her Utada Hikaru personality wasn't there, but only the newly Utada was. Similar story to TITO, but she could feel a little more or less like Utada Hikaru here because of Automatic Part II, and that some songs could be a little more personal. It is like she has been reincarnated as another person, but still is Utada. She said herself that Exodus was only the beginning, and she has "grown up" after that. TITO wasn't as great as Exodus IMO, but it's only the 2nd album. I predict we will see Utada's 3rd English album in 2014, if the pattern continues. The Utada Hikaru Japanese album, I predict next year for some reason. Maybe 1 more Japanese album before the English one.

Edit: I accidentally picked Utada, I wonder if a mod/admin can fix that lol.