Blog is for more personal writings with occasional musings.
While Essays are (ideally) where I'll move more of my longer/more structured writings.
(Though I'm debating on making a another cateogry depending on if I start writing things that can't easily be classified
as either.)
What I tend to write about in Blog is about my personal life, potentially also stuff about the site. Essays is generally for media. Not necessarily fandom oriented.
Since I do want a place to put my more general essays that aren't specific to a fandom.