Computers in the GT series are very high-end; they are also exceedingly expensive, large, and heavy. Some of the computers in this series distinguish themselves from the competition by their mechanical keyboard and the very high quality of their display (120 Hz G-Sync compatible, for example – see LaptopMag’s test of the GT75 Titan). The MSI GT83 Titan features an enormous 18.4-inch display in addition to dual GeForce GTX 1080 graphics chips connected via SLI.
Less-expensive mice tend to have optical sensors, which offer good tracking sensitivity and tend to map well on a variety of surfaces, including textured ones such as cloth. Laser sensors, on the other hand, map onto the same or more kinds of surfaces (including some smooth or glossy ones that may give optical sensors fits), but they can be more finicky about rough surface textures. That said, we wouldn't let one kind or the other be the main reason you choose a mouse. Likewise, some vendors market branded versions of sensors that track, say, on glass or reflective surfaces. Don't take them too seriously, as you can solve any challenging mousing surface with...a $2 mousepad.
Gaming laptops can put a serious dent in your wallet, with some of the fancier models costing upward of $3,000. But who says that the right rig has to cost an arm, a leg and the soul of your firstborn? Fortunately for the fiscally conscious gamer, there are some sub-$1,000 notebooks that can run graphically taxing games like Destiny 2 and Shadow of the Tomb Raider at solid frame rates.