Wow, Dell stuff on a Mac site, nice. Whichever:Wow... I had just been lusting after both a Dell XPS 15 and a 17" screen (like that of the ultralight LG Gram 17"), and a friend emailed me about brand-new new Dell XPS models, which include a new 17" screen! (Unfortunately, with revenue way down after Amazon's drastic commission cut, a purchase may not be viable. I'm also curious about Linux compatibility.)
Dell has been my daily driver for laptops for a long time now (current squeeze is the rather wonderful 15" XPS 9575 2-in-1 convertible: touch screen, foldable, UHD display, dual graphics, etc.).
In any case: yes, Linix is well supported on the XPSes, and most recently there is even a single free download installer from the Windows Store for Ubuntu. However, I don't see much of this directly related to Dell (someone may want to correct me), but more so in terms of Windows more broadly, whether native or in Windows Sandbox. These days I'm much preferring Windows 10 (especially Windows 10 for Workstations) over macOS (especially Catalina).
One thing aside from performance specs I'd like to mention:
The Dell extended warranty options (vs. Apple): greater number of 'tiers' and choices from Dell, but for slightly less than the same price as three-year Apple Care: at home service. Wonderful.
Only just last week my battery was getting sluggish with its charges and now much shorter run time. I ran the Dell Support assist and lodged a ticket with Dell. Two days later a free replacement battery was shipped to my door, with a subsequent free pickup to return the old one. Dell also 'let' me open and fit the battery myself - who would have thought! Of course, I also have the options for a tech to visit and fit, again, free and part of the service contract.
Personally, would prefer a convertible (a dual-screen job coming on the Dell roadmap, I believe), but who knows, may well pull the pin for one of these new 17" XPSes.