A Project Sputnik laptop from Dell with Ubuntu pre-loaded is a safe bet. I'd personally opt for an XPS 13" Developer Edition, even if I were going to load another distro like Arch Linux. Project Sputnik's objective is to ensure Linux compatibility, which involves picking components that are compatible out of the box, and submitting upstream patches for those that aren't.

It does help that it's also the laptop that Linus is using: https://www.cio.com/article/3119876/linux/linus-torvalds-pic...