I enjoy keeping to canon primarily for the intellectual challenge, and tend not to break it without a story-driven reason (e.g. writing an AU), but I don't instinctively think of made-up things (e.g. TV scripts) as "factual". As I say, takes all sorts and, if I'm not assuming too much, the accurate detail of world-building is a greater draw for you, and story-constructing and character exploration are a greater draw for me.