Optical sensors are the most popular with gamers since they tend to have less jitter and smoothing problems. These sensors work by casting down infrared or LED light onto your mousepad and capturing thousands of digital images per second, that then reveals the precise location of the mouse to the PC. On the other hand, laser sensors use a vertical-cavity surface-emitting laser diode to determine positioning. In most cases an optical sensor will do just fine. However, if you plan on using your mouse on a translucent surface (like glass), a laser sensor is preferable since it will have better sensitivity to a variety of surface textures.