I have always thought that Paul was by far and away the most talented of the Beatles. I thought he was a far superior vocalist; a much more musically versatile artist and one who had the additional gift of writing outstanding lyrics. Paul IS the more technically ideal voice and John IS one who was emotionally connected.
John exudes Id; Paul Superego.* In Freudian terms, "Superego" works in counterpoint to the Id. The Id is instant satisfaction. The Superego is the socially appropriate behavioral aspects; regulates one's sense of what is acceptable.
George was more the "Ego," which works between the Id and Superego. In Freudian terms, the Ego is a mediator trying to balance out the interests and needs of the Id and Superego. The Ego tries to placate the Id in a way that will pay off in the long run rather than provide a quick fix or pain. (Think of George telling Paul that he [George] would play if Paul wanted him to and he wouldn't if Paul didn't want him to.)
Ringo, I think, teetered on the precipice of Id and Ego. I guess he was an Igo.
Now, in truth, I disagree with the majority of Freud's teachings and think he was full of bull, but I do find the triad of Id, Ego & Superego fascinating and in this case could appy the concepts to the Beatles.
*This term is being used ONLY in the Freudian sense to discuss the Beatles in Freudian terms. It has nothing to do with one's ability or esteem or view of themselves, which is something known ONLY to that individual. It is to clarify these terms and apply them to the Beatles. This post is strictly subjective and does not reflect the thinking of any other person.