Do cylindrical goggles fog more than spherical ones?

Not inherently. Fogging is determined by the anti-fog system (dual-lens construction and coating quality), ventilation design, and how well the goggle seals to your face. A cylindrical goggle with premium anti-fog coating and enhanced ventilation will resist fogging better than a spherical goggle with standard coating and minimal vents. Cylindrical goggles do have slightly less internal air volume than oversized spherical models, which means humidity can build up marginally faster, but this is a minor factor compared to coating and ventilation quality.