For me it's Dell's Xps Laptops.
My colleagues and I have some and they are always broken.
We got replacements for the screen, fans (so many broken fans...), motherboard, docking Station, battery (swelled),... Don't by it!
I have an extensive recent personal history with looking to people like linus tech tips for laptop reccs, buying a dell xps as they suggest and then experiencing they are awful compared to anything made 10 years ago
I would want to know this as well, latest Thinkpads are not as user serviceable anymore, Lenovo said they will support Linux on some models. I wish Panasonic Toughbook 55 were officially supporting Linux, that's a great looking modular machine.