Hikki's a J-Pop classic, and the lyrics are amazing! It makes me go all nostalgic xDD
Koda's is good too, one of the best album tracks on Kingdom, but I think it's her weakest Arabian styled song. JUICY or Candy feat. Mr. Blistah are cooler and more memorable, but Amai Wana is great anyway
So, I go with good n old Utada