The G14 is the smaller and lighter option here, as well as the nicer made and the only one to integrate a finger-sensor. The M15 is a slightly larger and heavier device, and comes in close to the G14 in terms of build quality. Finally, the G15 is the more budget option here, with a plastic construction and mushier inputs, but gets the FHD 144 Hz or 240 Hz screen options also available on the M15 as its main advantage over the G14, alongside the competitive pricing.