3D sells the premium vibe; 2D keeps the focus on the page. Neither is “better”—they answer different questions about how serious the publication should feel and how hard the GPU should work.
3D templates add perspective, lighting, and a sense of thickness—readers subconsciously compare the experience to a printed book on a desk. That is great for fashion, real estate, and anything where emotion matters. 2D flip keeps the motion flatter and often feels snappier on older laptops or very long PDFs where you do not want every turn to feel like a mini cutscene.
The same file on templates tells you more than any article. Flip twenty pages in each mode and notice eye strain, not only aesthetics.