[Patrick]

The Original.

I loved him as a child - he just seemed magical and stuff, and like a protector of Hogwarts. He honestly seemed like a great guy who could do no wrong.

However, I think the latter one is great too - but he just seems alot more darker, and less welcoming than the original one.
He seems scary, but more like a Grandad to Harry than the original one would of been.

And I agree completely with what Glenn said - would of been interesting, I can't imagine seeing Richard Harrison in that scene though.

Both of them work great for their time, the original one was fantastic for the first two light hearted films and Gambon worked brilliantly for when the series changed direction.