I would offer that the XPS 15 is a better deal since you can get it with a matte screen and it also allows upgrading both RAM and SSD. You cannot update the RAM

I would offer that the XPS 15 is a better deal since you can get it with a matte screen and it also allows upgrading both RAM and SSD. You cannot update the RAM on XPS 13. Not sure if they've changed the ability to upgrade the SSD is newer models. Also, I'd say that Dell's customer support is horrendous. I bought an XPS 15 from them but had issues with the trackpad (which I think in hindsight were software/firmware related). It tooks months to resolve it, and by the time they did and they were going to replace it, they no longer sold the white XPS 15. They offered the gray one, which I didn't want, or a refund. They basically told me to buy a computer from someone else as there's "plenty of laptop makers around who might make a white one" (paraphrased). I also had to call them and tell them to stop the replacement, as they originally just kicked it off with a replacement that was not only not the correct color but had the completely wrong specs. Basically every email and phone call was with a different person, for the same support ticket.