I saw this today: Watts, Less are better

Stepping around the comma, less refers to something being physically smaller while fewer is the word you'd use to describe a smaller quantity.

Many people don't like fewer and will try to argue that it's the implicit number that is physically smaller, allowing it to be lesser... Normally I'd allow that but the word are overrides this, clearly implying that we're talking about the quantity of Watts.

You also have the opportunity to sneak in so spatial-clues with something like lower but this only works if it suits the graph (most of yours do IIRC).

The phrase should be one of the following:

  • Watts. Fewer is better.
  • Watts. Less is better.
  • Watts. Lower is better.