Noise vs silence
For me, the biggest difference is the beautiful "silence" that comes with sailing vs. the monotomous rumbling that comes with a powerboat. I'm not saying sailing is completely silent, but you get natural noise of the wind and the waves which is typically completely lost by the dronning noise of the engine of a powerboat.
"To reach the port of heaven, we must sail sometimes with the wind and sometimes against it - but we must sail, and not drift, nor lie at anchor.”
- Oliver Wendel Holmes