I must say if I was to choose it would be Harry. Really because of all those really awful nasty Snapes out there that makes Harry's life a complete misery before making him extremely happy ;)
I think that makes me prefer happy fluffy snarry's too. Though a good angst story is always a treat to read, especially if at the end they end up together.
Though I have read a couple of fics where Harry is a complete bastard and I've wanted to rip him a new one for being so horrible to Severus, so perhaps it 'swings & roundabouts'.