Intel's newest Comet Lake-U processor seems to be good option for "bursty" workloads, but its mediocre Turbo Boost sustainability can make it significantly slower than even the Core i7-10710U based on our Dell sample.
https://www.notebookcheck.net/Our-first-Core-i7-10810U-benchmarks-are-in-and-they-are-not-great.482451.0.html
The XPS just has a better cooling solution - in the Latitude, as your results say, temps were below 70C. I would expect a flagship laptop to perform better than a business one honestly.