+1 for the Dell XPS 13. It was actually one of the top contenders for my everyday carry laptop. I was originally looking at the models from a generation or two back and they were great, but now that they have added the HiDpi display and USB-C/TB3 it is only getting sweeter. I actually ended up going with the Precision 7510, but that's because I got mine with a 4K screen and 512GB NVMe drive and threw in a 1TB SSD I had plus upped the RAM to 64GB for a monster virtualization machine. The benefit is that I can run Windows/Linux/macOS in VMs and still have plenty of resources for streaming/podcasts/etc. The XPS 13/15 and Precision 5510/7510 were really the only options, I try to avoid the "Apple tax" if at all possible, and though they hold value like a Toyota I just can't see paying extra for a system I can't upgrade or repair.
The crazy thing I've discovered is that my Precision will charge/operate all the way down to a 65W power supply, even though the one shipped with it is 180W and the TB15 dock recommends a 240W PSU for anything other than the XPS 13 when used with the dock. The TB15 has some issues with overheating, but I've been able to charge my 7510 from only the dock and drive 2x 4K@60Hz external displays in addition to the internal display without much issue, and I'd imagine if I used the separate power supply for my laptop as well the performance would only get better as the CPU/GPU wouldn't be running in a lower power mode. With Windows 10 and battery saver mode I can get 4-5 hours or more, if I closed out my hundreds of tabs in Chrome that would probably go much higher.
The Dell Power Companion 6 cell 18kWh is also capable of adding an hour or more of life to the 7510 via the Dell plug or you can get the USB-C 12kWh Power Companion and use the cables from that with the 18kWh for a really convenient boost for anything with USB-C. The two high output USB ports on them are also awesome for charging your phone/tablet without draining the laptop via it's USB PowerShare.