I know most people will vote for the other one, but I’m more of a fan of their power pop phase, so I’m going for
Help!
It maybe wouldn’t be my ultimate pick for that phase, but it’s fairly representative, and when the key moves up and John revs up that twangy scream of his going Help me if you can I’m feeling doww-owwn… it is one of the greatest hooks of all time.
(I knew this was going to be the one from the beginning - it’s routinely picked as the top Beatles song in polls. Though I’m surprised “Strawberry Fields Forever” didn’t make it higher)