Paul McCartney in The Guardian:
Being far out is not something I'm known for too much, but I do enjoy that side of things. If you look at things I've done, from Why Don't We Do It in the Road, which is kind of out-there, to Carnival of Light, which is so out there it hasn't even been released, you can see I like experimenting. I don't like this phrase “more than John”, though. We grew up as a couple of kids in Liverpool and I think we were both as earnest and experimental as each other.
In the 60s, I happened to have more opportunity to do some of that
stuff because I was living on my own in London, whereas John was in the countryside in Weybridge and married so he was a little bit more pipe and slippers! I was out in the clubs and Wigmore Hall, catching people like Cornelius Cardew. I was into Stockhausen and stuff. So I had more of an opportunity but I don't think that made me more experimental than John. I just possibly did a bit more during that period. And John ended up with Revolution No 9 so, perception wise, he was the most experimental Beatle. But that was something I'd been doing off-piste, as we say in the skiing business. I'd been doing it for a hobby and he was smart enough to bring it into the main event. That was John's courage. But I think we were both equally experimental.