I'd recommend anything with an SSD mainly for reliability over speed. If you use it at night, in the dark, in front of tv, etc... you might like a backlit keyboard.
Those Dells are pretty high end. If your budget is that high check out Sager.
https/www.sagernotebook.com/home.php
Clevo is a company that makes a blank notebook chasis with video, motherboard, screen. You basically add the CPU, RAM, hard drive and configure the OS for sale. Sager is one company that sells Clevo based notebooks and are one of the best and well known. It's all high end parts, they stress test each machine before shipping it out to you, and their after sales service and warranty is top notch. Clevo is the best, and Sager is one of if not the best saller of Clevo based notebooks.
If I wasn't getting a Sager, I would definitely look into an Asus notebook. Also seeing how laptops aren't really upgradable or repairable, I always recommend an extended warranty. Your spending big bucks to get a nice portable laptop and the worst thing that could happen is something breaks and you can't fix it. It's not like the desktop where you can just replace a piece. Your paying big time for the portability, better insure that investment.
Some companies have bloatware or customized windows interfaces or addons. I hate this stuff and prefer a virgin original copy of Windows with no fancy addons. Basically a plain old generic laptop with no manufacturer ads and apps. HP is known for this stuff. At least with a Clevo you know it's just a plain old version of Windows 10 on there.
Also from experience over the past 20 years I can tell you that I have personally seen the best reliability with Clevo based notebooks.