Mrs R will make you pick one of the films, but you don't get them all.
I don't see how. That would be akin to having you take one episode of The Civil War or any other Ken Burns series. Just because these were released seven years apart doesn't make them any less of a whole...in fact, it makes them more amazing. To me, the Up series should also contend for GOAT, though I know tim judges that and he is weird.
Were they ever shown on American television? I'm only familiar with them as US art house releases.