There is a naming convention with the manufacturer's product lines that are a little somewhat difficult to follow sometimes.
1. HP Probook is a baseline model (huge downgrade of the elitebook)
2. Lenovo ThinkPad L series, non-X, generic Thinkpad Yoga (non-X) series are the downgrade of the T-series / X-series / P-series
3. Dell Latitudes are even trickier, they use numbering systems. You kind of have to look at the laptop to tell the difference with respect to the last product lines released of the predecessor/successors, the first MSRP price usually gives it away (not always), but the laptops will generally look much sleeker/attractive or have upgraded chassis points around the perimeters of the physical product, while offering more cutting edge technology (like higher-end IPS screens instead of TN panels or lower resolutions, however, the storage drive doesn't always give it away) - another thing on the Dell website if you buy new, is to keep searching for a similar model, some of the pricing/drop-down options are completely skewed and offer far fewer features/advantages for a more expensive Latitude of the same exact type/model.
If you're getting a replacement office laptop, I would only stick with the latter-flagship models from Dell, HP, Lenovo.
Business warranties on business products are far, far better than baseline consumer warranties as well.
The XPS line is a consumer line-up that boasts fun, radical features in attempts to compete with the HP Z books and HP Spectres and nearly all categories of Apple laptops, as an example.
XPS's are nice, but I wouldn't forfeit a Latitude for an XPS.
Also, the i7-4800MQ CPU architecture alone, will generally outperform any Intel 8th-gen i7 U-processor in overall office tasks and multitasking performance, even on M.2 NVME.
The i7-4800MQ is better equipped to feel more like a desktop replacement product than does the ultra-low voltage computing power of any U processors.
Excellent battery life on U processors, but performance hasn't been a whole lot better if you're expecting night/day performance-increase compared to a M-level processor from Intel generation 3 or 4. The Intel U-processor is generally designed to allow thinner chassis builds for laptops and supposedly quieter cooling system designs (varies greatly across different thermal engineering tactics paired with existing TDP).
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