Bishoujo Senshi Sailor Moon, Mahou Shoujo Madoka★Magica: The Different Story Recommendations
Both are definetely among the best mahou shoujo manga out there. Even though Sailor Moon is longer and starts out lighter, it eventually takes a darker turn which is similar to the general dark tone of Madoka★Magica. Both emphasize the importance of female friendship and companionship. Finally, in both of these manga the heroines undergo substantial character growth and are forced to make tough (and almost sadistic) choices.