Should i use amazon MP3 or iTunes?

I used to have an android and so all my music was on amazon. Now i have an iphone but i don't know if i should use itunes or amazon… Are they both the same?

You can use either, mp3 is just one format and itunes uses aac format, both sound great. Mine are all mp3 but thats only because I started with mp3 and I wanted to keep all the same format, but you can just select and add mp3 to your itunes file list, then copy to your ipod or iphone etc.