One night, Madoka has a terrible nightmare – against the backdrop of a desolate landscape, she watches a magical girl battle a terrifying creature, and lose. The next day, the teen's dream becomes reality when the girl – Homura – arrives at Mitakihara Middle School as a transfer student, mysteriously warning Madoka to stay just the way she is. But when she and her best friend Miki are pulled into a twisted illusion world and meet a magical creature named Kyubey, the pair discovers that magical girls are real, and what's more, they can choose to become one. All they must do is sign a contract with Kyubey and agree to fight witches that spread despair to the human world, and in return they will be granted a single wish. However, as Homura's omen suggests, there's far more to becoming a magical girl than Madoka and Miki realize...
Vividred is basically a brighter version of Madoka which is in the future. It also involves 4 girls transforming to fight monsters except the story is not as dark and there is more humour.
Mahou Shoujo Madoka Magica is a darker story than Vividred etc etc etc.
Also characters from both series are cute X3
Vividred Operation is, in essence, a magical girl show. It relies on science and technology for the girls to transform, but it's essentially the same concept as in normal mahou shoujo shows. Although Vividred is considerably more lighthearted and bright than Madoka Magica they share not only their mahou shoujo elements, but both series also follow a group of girls fighting against a supernatural evil, a strong friendship theme, and a very similar antagonist. Consider Madoka Magica as Vividred's older, more mature sibling and you wouldn't be too far off.
Both series are obvious magical girl series with a heavy emphasis on friendship. VO relies on science and technology while MSMM relies on hope. The major difference is that MSMM is MUCH darker than VO.
Senki Zesshou Symphogear is basically Vividred Operation with more plot and a far darker tone to it. Both series are seemingly inspired by Strike Witches.
Symphogear is more musical and dark with more dynamic characters however it's animation is somewhat wobbly.
Vvidred Operation is basically Symphogear light with a more broken plot and a amount of pacing problems. Only watch Vividred Operation after Symphogear if you are looking for some MOE fanservice without a deep plot.
Both of these shows are about a group of armoured girls that are almost military style magical girls. Both shows also have strong themes of friendship, and focus on that rather than simply destroying your enemies.
Vividred Operation is the more ecchi of the two series, while Symphogear focuses on music. Both feature characters who are drawn in the same cutesy style, as well as having similar, positive personalities.
In the year 1939 an unknown enemy called the Neuroi appeared. Their purpose is unclear and origin is unknown, but they attack and destroy any signs of human civilization they come across. Because conventional weapons are useless against them, humanity developed a striker unit known as the Strike Witches to combat the Neuroi. Miyafuji Yoshika is a girl with exceptional healing power but lacks control; she has been scouted to join the Strike Witches and fight the Neuroi, but all she wants to do is take over her family clinic. After witnessing an attack by the Neuroi on her way to find out if her father is still alive, Miyafuji resolves herself to fight for and protect the people around her. Who or what are the Neuroi and what do they want?
It's a bunch of girls, flying around defeating the bad guys. Pants aren't allowed for some reason.
They both have the same director and are filled with hot pants and panty shots. Boths series involve a set of chosen magical girls who have to fight an alien species in order to protect humanity. Vividred Operation is literally a copycat of Strike Witches but with fewer characters.
Athletic Mato is excited to start middle school and meet new people, including Yomi, an artistic girl who doesn't open up easily to others. While awkward around each other at first, things change when the girls discover their mutual obsession for a fantastical picture book. But just as the pair becomes fast friends, they're torn apart by a cruel, wheelchair-bound girl who considers Yomi her personal possession and refuses to let anyone else near her. What's worse, Mato has recently begun to have strange dreams about girls brawling in bizarre colorful worlds that seem to parallel her personal struggles. With jealousy, insecurity, and foreboding dreams always getting in the way, can the two girls ever become true friends?
Vividred Operation is brighter and more lighthearted than Black Rock Shooter, but both come heavy on the meaning of friendship theme, as well as featuring young girls with big superpowers. If you believe in yourself and your friends, you can conquer the world!