According to general opinions, Chapter 2 (二期) is often considered more stimulating and exciting for younger players. It has a faster pace, more complex gameplay mechanics, and a greater sense of accomplishment when progressing through the chapters.
Chapter 4 (四期), on the other hand, tends to be more challenging but also offers a deeper storyline with more elaborate cutscenes and character development. While it’s not necessarily less suitable for younger players, some may find it too demanding or complex.
Ultimately, whether Chapter 2 is “更刺激” (more stimulating) depends on individual preferences.