I agree with different points from so many people - as far as the POV of a story, I much prefer to follow Harry, as I much prefer not knowing what Snape is thinking, and Harry is also far more likeable (read: adorable!). However, to write, Snape is a gift; beautiful.
When I first started to read Snarry, I was reading solely to read about Snape. Any descriptions of Harry naked used to make me feel ill! However, because you can't have one without the other, I slowly fell in love with Harry too (but it took years!)