I like the epistolary style both novels have, though Dracula compromises more with it, at least so far, since I haven't finished it yet. Frankenstein, though always with the excuse that what we are reading is a letter/diary that will be sent or shown afterwards, redacting the unfortune of the poor Victor Frankenstein, is much closer to a regular way of narrating a novel from a protagonist's point of view for most part of it. This isn't saying that one book is better than the other, I really liked Frankenstein and I've been having a blast with Dracula, though I've also dedicated my time to catching up with some Spider-Man stories, so I can't give a strong opinion about the book yet