It's so hard to pick a favourite. Don't make me chooooooose!
Ok, it's Symphogear, but everything else is level. Probably. I mean, smash Lyrical Nanoha, Macross and Madoka together and enjoy the madness that is insanely over the top music powered mecha magical girl armour, with a stellar voice cast, surprisingly good representation and mostly tactful dealings with dark and sensitive topics without feeling dark dark grim dark. Hibiki can punch out a mountain, suplex a spaceship in the first five minutes of a season. It's on Crunchyroll now, it has proper subs now, it's legal. There is no excuse anymore. Look at her go.
In conclusion, watch Symphogear. (This is basically just my tagline at this point)(I am of the contraversial opinion this is the magical girl Aoi Yuki should be known for, it's just better)