I also used an XPS 15 for personal and work before switching to a Macbook, and it was also much thicker than a retina MBP. I didn't have a touchscreen model, but the touchpad was probably the best touchpad I have used on a windows machine (it even had good gesture support, like 4 finger swipe to switch programs). It did have some weird quirks like the optical drive would make a loud mechanical noise whenever you turned it on, and the screen would often get dust stuck behind it which was basically impossible to clean.
By the way, all Macbook pro models still have the 3.5mm audio jack.
By the way, all Macbook pro models still have the 3.5mm audio jack.