The specs would agree with you, but my real life side-by-side experience only demonstrates that the XPS is better for gaming. For everything else, my old rMBP is as fast or faster.

And my Mac runs for weeks, sometimes > 2 months, without a reboot. I've had to reboot the XPS on average twice a week (due to crashes, or updates, or really weird performance drops).

My real life side by side test show that turning off my machine at the end of the day isn't a big deal. The fact that I can run 2-3 VMs when the rest of my team can barely run one is a big deal. More ram is a huge benefit, everything I run in the linux subsystem runs faster than the macs I work next to.

Yeah, 32 vs 16 GB is truly a massive difference when doing virtualization. When you consider that the base OS and core apps (dev env/browsers) take up something like 2-3GB, you're more than doubling the available memory for VMs.

Not needing to reboot is a massively underrated feature imo

More powerful in what way? Processing power?

Processor is a little more powerful, testing shows them comparable in some testing since Apple can tune the chips a little more then Dell is allowed to. I have twice as much ram which is the real big leap forward, my hard drive seems to be a little faster also.