The people writing these articles are usually not the most skilled. They're typically just filling their blogs. I swear I've seen this same exact subject at least 5 times before HN. They're al rehashing from each other.
This article perfectly answers the relatively simple question it asks. It is exactly the kind of search result I'm looking for if I ever wonder which approach is better and don't want to experiment myself.
Sometimes this may be the case but not so much here. Firstly the mention the version they used and, secondly, OtterTune are a startup based around automatic DB steup/schema optimization founded by folks from CMUs DB group, they most certainly know what they are talking about here.