A good back scrubbing is awesome; but no matter how flexible one is, the pressure just isn’t as good as when someone else scrubs. I prefer a scrubbing to a scratching, because with regular scrubbing exfoliation, I don’t get anywhere as itchy as I used to.
Nowadays, my knots have knots, so a good massage is wonderful, and necessary with the spasms I get. So I’d choose massage over scratch or scrub.