There's no Music City Tamagotchi. Music City is the online place where you can go with your Music Star, or V6 Tamagotchi.
That being said, they're two totally different things.
The Music Star needs constant, constant attention, and the iD L can be left alone for an hour or two or three.
The iD L is in color and the music star is in black and white, so do you want to be able to see it during the day or at night?
Do you care that it's in Japanese? It doesn't affect gameplay at all. I know you won't believe me, but I play it just like normal.
Do you want to be able to remodel a room or your whole house?
Do you want to be able to plant seeds in the garden?
Give us more details about yourself.