When it comes to exfoliation, razor blades offer better performance than electric shavers.
Electric razors do exfoliate your skin to some extent. They also dispose of a very small number of skin cells. Similarly, tiny pieces of skin can poke through perforations in the combs or foils.
However, electric shavers will leave spots on your skin if you use them for exfoliating. It can also lead to razor burns if you press too hard on some occasions.