The primary "take-away" from this activity, comparing fiction and non-fiction features to determine the supports and challenges for ELLs, is that although non-fiction text provides significant supports to support comprehension of content, it is still more difficult for both native English speakers and second language learners.
All the features typical to non-fiction text are supportive of ELLs, in particular vocabulary, graphic representations of information, glossaries, and synopses.
The challenges for ELLs, students with language or learning disabilities, and those lacking in background knowledge is that they do not have the vocabulary or background knowledge to comprehend text content on their own.
In addition, there is significant variation in text quality. One of the activities in a reading course I've taught is to do an analysis of content area text features that support students with special needs. Students have found that authors and publishers do not consistently provide these supports effectively.
Another example I can share is that when using a well-known reading series in my district, I found the supports for ELLs to be minimal, repeating the same suggestions over and over without regard to the type of story.
Clearly, the skill of the teacher is the primary factor that supports ELLs' learning! This includes skills in choosing the best texts available, knowing what supports students will need, appropriate pre-teaching, strong instructional strategies, and on-going assessment of student learning.