Given that high-end components tend to drain battery life, don't plan on taking any of these gaming rigs too far from a wall socket very often. Cutting-edge ports like USB-C and Thunderbolt 3 are beneficial now, and will only be more so down the road, but look for at least two USB 3.0 ports so you can plug in an external mouse and a hard drive for your saved media files. If you mean to attach a VR headset to your GeForce GTX 1060-or-better rig, look for the right loadout of ports to accommodate it; you'll need a well-placed video out and enough USB ports for the hydra-head of cabling. Other video ports, like HDMI or Mini DisplayPort, will be helpful if you want to play games on an external display, but aren't absolutely necessary if your laptop's screen is large enough.
We tested the laptops using BioShock Infinite’s benchmarking mode and by playing half an hour of The Witcher 3 on ultra with VSync off. We measured the laptops’ internal temperature using HWMonitor and measured the surface temperature at various points on the keyboard and underside using an IR thermometer. We tested each laptop’s screen using some of the Lagom LCD monitor test pages, and used each for several workdays to get a feel for its keyboard, trackpad, screen, and speakers.