As a person, really? Gandalf is harsh and doesn't help when he can, all the time. He is brave, I give him that. He isn't very funny. Compassionate, occasionally. Kind, depends. Dumbledore was a good man, granted he lied a lot, but he did what needed to be done. He was always kind and helpful, most of the time.
Edit: Don't get me wrong, I love LOTR and I like Gandalf. But as a character, I like Dumbledore more. It's not so much that he's a better person, but more that he's nicer and I feel like he tries to help more. Gandalf feels colder to me.