Over the last 5 years I've owned 2 Dells that I've really liked.
My current machine is an XPS 15, it's an i7-11800H generation system
The previous one was an Precision 5520, an i5-7440HQ generation machine
Discounting the basic design, looks, ports, ........
Difference between the two lines? Out of the box configuration options (installed ram, drive size) and graphics options. The Precision use Intel UMA and workstation graphics cards. XPS systems have Intel Iris and your more familiar gaming like cards. Iris is actually pretty good for integrated graphics, UMA? Not as good. Workstation graphic cards are better if the applications can make use of them, but they are more $$ than your typical cards and may not be as good for gaming.
What do I like about them:
Good screens
Not light, but not really heavy either
And the big one - UPGRADABLE. Each of the 15" models I had/have have 2 upgradable RAM slots and 2 drive slots/bays. My current system has a 500gb boot drive and 2tb data drive that I bought separately and add myself.
And if you are comfortable taking the back off a laptop it's almost always cheaper to upgrade RAM and disks yourself.