Qui-Gon Jinn by a mile. And here's why... Throughout the PT Yoda proved to be blind and dogmatic on many an occasion. For one thing when a prophesied Chosen Force user comes into the Jedi order shouldn't that individual warrant a little more attention than he was given. All of Anakin's warning signs were there and yet there was little to no reaching out by Yoda or the rest of the council (save for Obi-Wan). When Anakin does come to Yoda seeking advice on how to respond to his nightmare Yoda comes back with vague generic "let go of all you fear to lose" and "the shadow of greed". Now when the Chosen One comes to you talking about nightmares of losing someone close to you (which based on any amount of observation throughout the Clone Wars you would have to know is Padme) shouldn't your response be a little more tailored than just the first page of the "how to be a Jedi" pamphlet. "Dark side clouds everything" or not, Yoda was more willing to believe in idealistic and unrealistic tradition than in a logical interpretation of all the evidence surrounding him. Jedi like Pong Krell and Barriss Offee were succumbing to the quick and easy path. Why would Yoda not see that Anakin, who from day 1 had attachment issues due to his late introduction to the Jedi path, might be vulnerable to Dark Side influence. Especially when he has a close relationship to Palpatine who the Jedi council are suspicious of for his cunning political tactics. It was not until his self-exile on Dagobah (20+ years of reflection on just what went wrong) that Yoda gained his sage wisdom that we attribute retroactively to his character in the Prequel Trilogy. And during that time he communed with Qui Gon who had a history of questioning the council and being a more bohemian Jedi. His unique approach to the Force is probably what the unstable Chosen One would have needed. Lastly Qui Gon proved himself to be the Jedi with the most understanding of the living force as it was he who broke the barrier and could commune with the living after death.