The deciding factors, especially if you are choosing rotary and a foil shaver, are the frequency of shaving, the sensitivity of your skin and also the contours of your face. If you shave daily, require a close shave and have sensitive skin, you may prefer foil shaver. If you have pronounced facial contours, shave irregularly and don't require a 100% close shave like a razor, then opt for a rotary shaver. For a more detailed comparison please follow the link.