What are some alternatives?
When comparing Dell Precision 7730 and Dell XPS 15, you can also consider the following products
Razer Blade Pro - Razer Blade Pro is one of the most powerful and yet slimmest gaming laptop in the world that delivers an immersive experience in an incredibly thin form factor.
Dell XPS 13 - The XPS 13 ships with either Ubuntu or Windows pre-installed and is a top-of-the line ultrabook, with specs similar to the Macbook Pro 13", but half a pound lighter.
System76 Oryx Pro - System76 Oryx Pro is a powerful and customizable laptop that comes with Linux pre-installed, but y can easily install Window and dual-boot if you want to use it for Windows development or gaming.
Lenovo ThinkPad X1 Carbon - The Lenovo Thinkpad X1 Carbon is an excellent business Ultrabook which will get the job done, no questions asked. It's extremely sturdy and durable without making any compromises in overall design or portability.
Microsoft Surface Book 2 (15-inch) - Microsoft Surface Book 2 (15-inch) is a laptop and tablet that can handle the modern PC games.
HP Spectre x360 15t - The HP Spectre x360 is an excellent 2-in-1 laptop with long battery life and an amazing display. It's very slim and lightweight, which makes it perfect for people that use their laptop on-the-go.