I think Paul, John, George, and Ringo were all very talented. I think it is pointless to attempt to say one is “better” or more “talented” than other.
I do believe that they were all better musicians when they were together as a band and not as individuals. Paul and John’s competition with each other tempered their creative excesses (most of the time - i.e. revolution number 9). George got the short end of things, but his contribution to the band was definitely a positive influence on their sound.
When they separated, the creative balance they had as a band was gone. I mean if Paul had asked you to play with him on a new album, would you have the guts to tell him there was something musical he was doing that you didn’t like? Probably not. It’s hard to argue with legends to their face.
Well, not to be disagreeable, but if you look at quality and quantity of songs written by either John or Paul, you come away with an admiration for the number of quality songs Paul wrote relative to John. All of this writing was done in a very compressed period of time. I agree, that when the two separated, neither wrote much to match their previous output, but I chalk that up to them being exhausted and played out. It was at the end of the bands string that George really started showing up with his own songs. I am convinced he got his songs recorded because John’s production was simultaneously dropping and they needed to fill an album. My feeling is that John was pretty much played out by the White Album and Paul and to a lesser extent George provided the bulk of the new material on the last two albums. My opinion - just saying.