I love this question, because I LOVE trees! I'm a tree climber and hugger from way back. I'm not sure I have a particular tree that is my favorite, although I've always been partial to the OAK because of its sturdieness. However, there are so many beautiful trees that I don't think I could pick just one.
I look at the way the tree grows, its foliage, the texture and color of its bark and even the climate it grows in. I've always been attracted to trees that seem to 'call to me' as weird as that may sound. I have previously written a hub about trees and my relationship to them. The title is: Trees-magical, mysterious and sacred. Hope you check it out.