I'll second almost everything Jemima says. In fact, she said everything I would have said, so I won't repeat it.
My only difference would be that I prefered TPS just a little, little bit. I simply adored the sense of wonder I got, seeing Hogwarts for the very first time. As much as I love the HP characters, it's Hogwarts itself that enchants me most. The delectably luscious Lucius, the wonderful job by Branagh, the dueling scene, even the Weasley home... as great as all these were, they can't counterbalance that sense of wonder that I love.
PS: I also totally agree with Jemima on Hugh Laurie. And Gemma Jones. Just for the record.