This site has some good information. It's focused on used models, but it gives you a basis for comparing the product lines of Lenovo, HP, and Dell.
For pc laptops, even if you find a good model once, chances are that the 'model line' branding decisions have quite possibly shifted by the time you're up for your next laptop. So you often end up having to do it all over again.
This is exactly it.
While I live abroad and could afford one, it doesn't offer the CPU/GPU combo I care about, so in spite of the body quality I never bought one.
Not to mention that the last OS releases quality isn't that inspiring.