Though if you’re good with using Ubuntu then new ThinkPads and Dells and some others generally work well as you get the enablement patches before they’ve rippled through to the mainline kennel. However you still often have a happier time waiting for others to iron out the kinks, not to mention better hardware prices by getting clear out deals for outgoing generations.
After years of ThinkPads I joined a company that gave me a Dell Inspiron and I am unimpressed in various minor ways. Crap keyboard is the big one.
I’ve used ThinkPads for ages and it’s very true they have become more and more ordinary as the years go by, but I recently got given a high spec Dell for a new job and it’s been very disappointing. In particular the keyboard is terrible to the point that on business trips I bring an external keyboard with me. I also sorely miss a trackpoint, but to many people that is not an issue.
I was also surprised that I miss the ThinkPad ability to open up 180°.