I find it more difficult to read text that are short, concise, but using lots of specialized vocabulary. However, a problem about the second choice is making it simple in words, but structured in such a way that ensures both attention and comprehension.

The problem with walls of text, and a problem I also encounter in stuff I write myself, is how there's just a wall of text. A string of lengthy paragraphs consisting of long sentences that just go on and on without providing the reader a place to pause. That is: a point in which the reader can stop, check for comprehension or just a breather.

Reading such a block of text can be tiring.

I've been taught to employ a variety of sentence and paragraph lengths, and try to apply them to my writing. However, this can run the risk of making the result disjointed and rambly. I am guilty of this myself. I realize that this just means I didn't take the time to collect and organize my thoughts before typing things out. It can be as simple as thinking about what I want to say in the first place, or it can be as involved as thinking about the main point and any supporting points, and how I can lay them out such that they flow neatly in the result.

Longer texts can be improved with just a bit more care in their composition, and without it, walls of text are definitely a chore to read.

EDIT:

I should proofread before hitting post.