The Dell XPS range has always worked great with Linux, I've not tested the latest model but the previous model is flawless :) Plus you get a decent GPU in it!
I have been using Linux since I was 14 and professionally since I was 18 - Ubuntu makes so many things simple nowadays. It is my preferred choice on both Server and Desktop - I would imagine if you are dealing with Legacy systems you might want specific stability and kernel versions but otherwise there are very few reasons to not give it serious consideration
