My suspicion is that blogs have ads and documentation doesn't, and that's why the results are like this.

Totally agree! My point is that they both probably contain the same answer and I bet that's all most people care about. I think most of us here have strong preferences for picking the "most appropriate" source, but frankly, I suspect we're weird.

In my experience, blogs are mostly young students trying to build an online presence or something similar, and contain bad advice and wrongness.