16:9 vs 16:10 and high res.
Back in the spring I moved from my 5+ YO 13" unibody Macbook to a Dell XPS15 with the same QHD screen as the Dell laptop in the article. Based on experience, 16:9 is terrible on a 13" laptop, and I shudder to think how horrid it is if you've got to work with it.
16:9 on a 15" QHD screen feels significantly less cramped than working on a 1200:800 13" screen. There, I said it. 16:9 is OK on a 15"+ laptop with decent resolution. It's no substitute for a reasonable 24" 1920:1200 screen (there are more important things than pixel pitch) but it's certainly a much nicer option to live with than many.