The advice to go for the most boring laptop possible is out of this. I would avoid laptops with dual graphics (integrated and discrete) as much as possible. That's more or less what System 76 does. Dells are usually trouble-free unless you want a "mobile workstation" or gaming laptop. Full support for Intel's 12th gen will probably take a while to trickle down to mainstream distros (you should be fine if you compile your kernel from upstream though), so, if you are on the market now, I suggest 10th or 11th gen. Or wait a couple months.