[dellpluslinux89]

As far as I can see, they're the same chassis. It seems configuration options are all that's different. Though they refer to XPS 15 as 9550, not 5510.

On the Precision 5510 site I'm able to tweak CPU options, RAM, disk. The XPS 15 site, I can only pick from stock builds (and a bunch of upsell addons).

The Precision 5510 site also has the option to pick Ubuntu and avoid the MS tax. Not so on the XPS 15 site.

I think you can look at it from a website usability mindset: XPS 15 site is simplified for consumers and Precision robust in options for business.