Mesh seat or padded seat for long hours?

This is the most contested question in the category. Reviewers on r/OfficeChairs and r/homeoffice are split: some say firm mesh seats prevent the sweat and pressure-point issues of foam, while others report that tight mesh seats create hot spots under the thighs or even sciatica-like symptoms over long sessions. Body weight and sit posture matter more than the mesh-vs-foam choice in isolation.