Which game is considered to be the best in this series? There's always been discussion about Gradius and R-Type, but I never see this equally awesome series talked about!
I've got Sagaia, Darius Twin, and Super Nova on cart, and Darius Gaiden on a compilation. So far, I enjoy Darius Twin for its atmosphere, and Sagaia for its more fast-paced gameplay. While the series feels like a ripoff of Gradius, the simpler powerup system and ability to select your path really does set it apart. There was nothing fun about having to collect so many powerups in Gradius just to scroll through the upgrade options.