My vote goes for the Oda because I've always had a soft spot for Nobunaga. I agree that it took him a lot of luck to actually beat the odds and ascend from a minor lord to the most powerful man in Japan, but I still think he was genuinely brilliant in many ways. It's not just that he was a significant military modernizer (I don't think "innovator" would be correct word since he was obviously not the first Japanese lord to use firearms or ashigaru peasant armies, but brought those innovations and other to the next level by massifiying and integrating them into a cohesive military strategy) but he also genuinely understood government and economics. He patronised trade, abolished unnecessary monopolies, provided for open craftsmen guilds, promoted the construction of roads and bridges, etc. He was a thoughtful guy who knew how to govern. To be fair, so was Iyeasu and even Hideyoshi, but both of them were in a more precarious position than Nobunaga would have been, which perhaps partially explains why they couldn't afford to be as bold and unconventional in their approach...
Basically, Nobunaga is a rare figure in history. A person with both the will and the means to overturn the old way of doing things and forge a fully new approach - within limits, of course.
That said, I think everyone would want Japan to avoid Sakoku and develop extensive trade relations with the rest of the world (including Europeans), and while the Oda could allow for that, it would be a safer bet to goe with a clan that was located further to the west, like the Mori or the Shimazu.
Still... they don't have anyone as cool as Nobunaga