Personally, I identify most with Harry-- I see him as a kind of Everyman in the books, so it would make sense that I find him easy to relate to. However, for reading and writing, I prefer snape. I love wit and sarcasm, and he's quite dynamic. Both are malleable characters for writing, but I find snape's history and personality much more interesting to work with. Ironically, despite identifying more with Harry, I have yet to be able to write a story from his perspective-- I always have to view him from snape's perspective.