Only 16 gigs of RAM? Why do companies still hold that limit in 2018? I was hoping for 32 gigs back in 2015.
Went ahead and purchased a 32GB System76 Galaga Pro last week with the same i7-8550U available on the XPS. It's a slightly larger 13", but feels a lot closer to my 5th gen XPS 13 than the MacBook Pro the Galaga replaces. Comes with a retina-like matte IPS 3200x1800 screen that is a joy to use. No touch, for better or worse. Keyboard layout is actually superior to the XPS for development with dedicated home/end/pgup/pgdn buttons. Pop!OS is nice and worth a spin, plus it has XPS levels of support under Ubuntu 16.04 which is available pre-loaded. Camera is in a much more useful place than on the XPS. It's also cheaper at most configurations.
Downsides are a smaller battery (probably to make room for both an M.2 SSD and a 7mm 2.5" drive bay) and a touchpad that while multitouch and decent isn't as good as the XPS touchpad. Also, while the screen hinge feels more solid than the XPS's, it doesn't go back as far as I would expect. XPS uses better materials in spots, like soft touch carbon fiber in palm.
So far I'm extremely happy with the Galaga Pro and would recommend to anyone who wants a small powerful laptop like the XPS 13, but is turned off by its 16GB limitation.