Dell XPS15 VS Lenovo X1 Carbon

What sort of issues? For Deployment I've found Dell's packs to be easier to integrate and find

The Dell Latitudes are heavier duty.  I find that these are sturdier and more reliable than the Thinkpads these days.  I'm wondering if it's because they're heavier so people don't lug them around as much, therefore get less banged up.  Dell really improved when Michael Dell took back his company.

The XPS series are designed to be lighter.  These have had more trouble.  Their quest for thinner and lighter seems to be lacking some quality control.  I don't know if it's because it lighter in weight so people inadvertently abuse them by carrying them around more frequently to get banged up, but they also suffer form flexing issues too.

The X1 Carbons are smaller 13" screens than the XPS15, and seem to survive abuse better than the XPS13.  While it's technically listed with the Thinkpads, its keyboard is more like the Lenovo lines, rather the Thinkpad lines that kept their IBM keyboard roots.  The Original Thinkpad keyboards are still the best.  The non-Thinkpad models are terrible.  Certain models of the Yogas I've dealt with are especially terrible; I don't know if the rest are too.  Nice concept, but terrible implementation and QA.

I find Dells, overall, to be better than Lenovo.  There are a few decent Thinkpad models that are ok to get all other Lenovos are junk.

David, I've had several XPS 15s lock up out of the box, Dell wanted to send me new HDs, and have me install. I'm capable but I should not be asked to do this on a brand new laptop. I declined as a new laptop should not need new parts out of the box. We've had several that have had Wireless controller failures. Then there are a plethora of issues when docking with a TB16 thunderbolt dock. Dell seems to release BIOS updates monthly for these machines and thunderbolt drivers with the same frequency. The frequency of the updates tell me Dell is aware of the bugs in their systems and are trying to patch...
I've had a few screen failures within 2 months on the touch screen models. All in all the XPS15/13 have been terrible laptops. I should not need to repair hardware failures in laptops less than 6 months old.

Another HUGE issue that I worked with Dell on for months was screen resolution when connecting XPS15/TB16 dock and non 4k monitors. The screens got grainy, text fuzzy, and just overall terrible. The same Dell monitors connected to an Lattitude/E Port Dock worked fine with no issues. The end result of that support case was a recommendation to purchase all 4k monitors.

As for the old Latitudes, they seemed to be bullet proof... They ran great and rarely had problems.

We are a mixed MAC/PC environment so I made the switch to the XPS15 and XPS13 to give the PC users something comparable to the design of a Macbook Pro.

I've got an X1 Carbon 6th Gen queued up for purchase to test... I jumped the ThinkPad ship when Lenovo acquired them and the quality took a nose dive, but with the issues I've had lately with XPS15 I'm drawn back.

I have an X1 Carbon 4th generation here (My consulting machine) running Windows 10 Pro. David J. above has seen it. Excellent machine. I got mine nearly 2 years ago and it has been to a couple of MVP Global Summits and acquits itself well.

i7, 16 GB of memory, 1 TB SSD NVMe fast drive.

VMWare Workstation and a bunch of machines, Office 2016, Adobe DC Standard, QuickBooks and much else.

one-half inch thick and 2 pounds so easy to carry.

BTW - I got a 4 year warranty economically with the machine and have not used it yet.