1 is a direct translation. It just covers the same stuff, leaving some things out, but it paces certain parts better imo. Same title as the series
Mahou Shoujo Kazumi Magica is some weird spin off, its confusing and not particularly good. It also doesn't related to the established cannon as shown so far.
Mahou Shoujo Oriko Magica is another spin off, set(possibly) in one of the time loops Homura went through. It features Mami and Kyouko and has been good so far, so its worth checking out..