Hide detail is useful for readability, hiding extra details that may be less relevant, providing additional information, or simply organizing large post content (guide, etc). Typically, like Fireup said, logs or many images, but also a whole section, for example.
Blur spoiler, to be honest, I rarely see people use it. I would use it for relevant text, but you want to warn the user before he sees this part.
In your case, it depends on how much information you have to display. If you have a lot of content, using details is a good choice; otherwise, both are fine.