Touhou Perfect Cherry Blossom and Dodonpachi Daioujou are two of the most popular titles in the Touhou series. Both games are highly regarded among fans of the series, and each one has its own unique feel.
Touhou Perfect Cherry Blossom (PTCB) is an arcade-style shoot 'em up game developed by Team Shanghai Alice and published by ZUN Soft. It's a traditional top-down vertical-scrolling shooter which takes place in the world of Gensokyo. PTCB has 20 stages and five different kinds of danmaku bosses to fight. The gameplay is focused on shooting danmaku patterns and avoiding enemy bullets.
Dodonpachi Daioujou (DDP) is an action-packed bullet-hell shooter set in a futuristic landscape, developed by Cave and published by AMI. The game's 20 stages take place in a world of robotic enemies and intricate bullet patterns. Unlike PTCB, the game is focused heavily on dodging bullets more than shooting them. In addition, the player can choose between four different ships, and each one has its own unique play style.
Both games are great in their own right. PTCB has a more traditional feel and is more focused on shooting patterns and dodging bullets. DDP, on the other hand, has a more action-oriented feel, with more focus on dodging bullets and navigating intricate patterns. Ultimately, which game is better for you will depend on your personal preference and playing style.