When it comes to the safety aspect, Alexandrite and ND: Yag laser top the list. Also, the safety aspect depends on who is using the laser and how. People who are suitable for laser hair removal when get treated by a reliable service provider tend to be on the safe side.
On the other hand, if you are using at-home lasers and conducting the hair removal process by yourself without expert administration, you are more likely to be affected by side effects like road rash feeling, redness and irritation in the targeted areas.