Electric Foil Shaver versus Rotary Shaver
Choosing between a foil and a rotary shaver depends on your specific shaving habits, hair type, and skin sensitivity, as neither is universally superior. Foil shavers generally offer a closer shave with greater precision, while rotary shavers excel at handling varied hair growth and facial contours. 

Key Differences

Feature  Foil Shaver Rotary Shaver
Mechanism Blades oscillate rapidly (back and forth) under a thin, perforated metal screen (foil). Multiple circular heads with revolving blades that cut hair in a circular motion.
Shaving Motion Requires straight, back-and-forth strokes. Requires circular motions across the skin.
Closeness of Shave Generally provides a closer, smoother shave, ideal for a clean-shaven look. Leaves a slightly more "stubbly" finish compared to foil shavers.
Best For Daily shaving, fine/thin hair, sensitive skin, and precision styling (sideburns, goatees). Shaving every few days, thick/coarse hair, hair that grows in multiple directions, and large areas like the head.
Skin Comfort Often considered better for sensitive skin because the foil acts as a protective barrier, reducing direct blade contact. Can cause more irritation if too much pressure is applied, but modern models with flexible heads are gentler.
Contouring May require more passes and angle changes on curved areas like the jaw and neck. Heads flex and pivot to easily follow the contours of the face, neck, and head.
Noise Level Tends to be louder with a distinct buzzing sound. Generally quieter during operation.

Recommendations
  • Choose a foil shaver if you prefer to shave daily, have sensitive skin, finer hair, and need precision for styling edges and sideburns.
  • Choose a rotary shaver if you shave less frequently (every few days), have thick or coarse hair that grows in different directions, or want an easy, comfortable shave over large, contoured areas. 
Ultimately, the best choice is often a matter of personal preference and what works best for your specific skin and hair.