The simpler device is cheaper as less likely to break. A barrel charger is far simpler than a USB charger and cable.

Depending on what/where/how I hook up in DeskMode, I also have Power on USB-C. Mainly depends on how/where I want to route DP/HDMI-output. Also, POE-to-BarrelJack is a thing, while POE-to-USB-C-with-more-than-5V is not.

Yeah, I'd actually use the barrel charger on the road so that it can just live in my backpack and USB-C (provided by an appropriate dock that's connected to a keyboard, monitor, etc) at home.