I would absolutely suggest buying from a PC Gamer link. I do all my Amazon shopping that way, and it helps them financially. But the problem with their laptop reviews is that they pull the laptop out of the box, test it and write the review.
The question with gaming laptops isn't how they work straight from the box. They pretty much are all okay when you first start using them. The question is how they will be after a year or two of use, and that's something professional reviews can't tell you. Only consumer reviews know the answer to that.
This goes for most products--professional reviews can't tell you much about reliability--but it's especially important if you are going to spend $1500 on something to find out how it performs over time, particularly for a product as sketchy and typically terrible as a gaming laptop. Just about any other gaming product I wouldn't care, but most gaming laptops are just plain garbage.