XPS 15 9570; very happy. Linux is imperfect but largely good; I use i3-gaps on manjaro. MacOS also works, if you're interested in hackintoshing, with 2 caveats:

XPS 15 9570; very happy. Linux is imperfect but largely good; I use i3-gaps on manjaro. MacOS also works, if you're interested in hackintoshing, with 2 caveats: one, patching acpi tables is really hard (though I hear you can get help over at olarila). Two, you need a new wifi card (preferably an intel). If you gripe to dell about the old one, they'll usually send a replacement. Which is probably good anyway, since the killer is not good at all. i7-8750H, 1tb ssd, 4k screen, 32gb ram (really good for dev stuff). The screen is also excellent: you don't appreciate it until you've got it, but it's actually usable in bright sunlight. And the battery is huge; near the tsa limit for how much lithium you can bring on a plane.