I am only talking about the way that they speak about themselves. Not their whole personalities and sets of powers.
Don't know if other people have commented on this already but Obito sounds a lot like Aizen did during the end of the whole Aizen trying to kill everyone arc of Bleach. Just replace Juubi with the Hougyuku (don't remember what it was called) and replace Sage of 6 paths with "God" and their speeches are very similar. They both think they are transcending this dimension and are beyond humanity and mortality. They both believe themselves to be the new form of God, and that they have the right answer as to how the human should be molded and controlled.
I'd mention this in a more general forum but I don't want to spoil things for people watch the Naruto anime.
Agree? Disagree? I know there are some clear differences such as how they want others to see them (Aizen wants to be a clear, absolute ruler while Obito kind of wants to be acknowledged)