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Generally, Thinkpads are recommended. I think, Red Hat employees all have Thinkpads or something along those lines, which is why they get lots of patches to make things go smoothly. No official support from Lenovo, though.

Ubuntu on Thinkpad T series works well, e.g.

https://certification.ubuntu.com/hardware/201702-25371/

They are rugged and have a good keyboard. You can find a brand new at 70% of a Dell XPS price (at Lenovo's outlet / eBay / BHPhotovideo).

Woah I didn't know Canonical certifies Ubuntu on certain hardware. That's incredible, I love linux but I'm not a sysadmin and I've been burned before by hardware manufactures publishing windows-only driver binaries.

I use ThinkPad E450 (i7/16GB/SSD/FullHD). Started with Ubuntu 17.04 (unity), updated to 17.10 (gnome), didn't have any problems.