I'll put another little spin on this question: early in my Snarry obsession a non-fan writer-friend asked me who I identified with, Snape or Harry. (actually, who I fantasized being) At first I thought I feel like Harry but am smitten with Snape. It's similar to my 9yr old OST fixation -- I have a crush on Spock but I want to BE Kirk.
So at first it was about being a Snape-lovin' fool. That snark, that black hair, that billow: guh.
But as time has gone on, I've become a switch. Many days I'm the angsty and angry one who doesnt think he's good or pretty enough for his earnest young lover. Another day I'm the earnest fool out to save the world, desperate for some strong wisdom, and discovering just how much I'm attracted to the one who withholds praise and affection.