My two cents; if you want to use Linux on it, then do yourself a favor and pick a laptop from a Linux-first vendor. So the likes of NovaCustom, Star Labs, System76, Tuxedo and others found on the link over here come to mind. Besides that, it’s important that the device in question either has a dedicated GPU (or at least supports eGPUs). Furthermore, choose a device with relatively high battery capacity; they go up to ~99 Wh, so pick something that’s at least relatively close to that number.