I've had a company-issued XPS 9570 for the last year, and overall I haven't had any big issues.
Cooling is sub-par, but I think that's mostly due to the Intel i9-8950HK running way over the advertised TDP during Turbo. Dell has been tweaking their cooling profile in subsequent BIOS updates, at with the latest version (1.15) they're quite aggressive on ramping up the fans to keep things cool. Which is good from a performance perspective, but really annoying to sit beside all day. While I didn't experience severe thermal throttling, I did end up disabling Turbo as it made the laptop sound like a jet engine too often for my taste.
My only other complaint would be that despite Dell's claims of 100W+ power delivery from their ThunderBolt dock (above and beyond what USB-C PD can deliver), I frequently find the laptop discharging the battery under moderate load (high CPU, idle dGPU) when connected via USB-C to the dock. Using the supplied DC charger solves this, but it's still a poor user experience.
At my previous employer I had a 2017 MBP. IMHO an XPS/Precision is a better option as you can (in no particular order): upgrade the RAM, upgrade the SSD, run Linux on it, and (until the new MBP release) had a much better keyboard experience.
As others have noted, Dell's enterprise warranty support is fantastic. I was able to invoke the warranty to replace a motherboard in a Latitude I bought used on eBay; they sent a technician to my house to replace it free of charge.