The strongest claim is the one you can defend in 30 seconds
Pull up almost any company's homepage. Read the hero. Now ask: defend this.
"We help businesses unlock their potential."
Defend that. With what? Whose business? What potential? Unlocked how?
"The leading platform for modern teams."
Leading by what measure. What's modern. Which teams. Compared to which alternatives.
"Powering the future of work."
Stop.
Most marketing copy is not lying. It's worse. It's un-defendable. You can't argue with it because there's nothing to argue with. It hasn't said anything specific enough to be wrong.
I have a rule for the homepage of every project I touch. Every claim has to be defensible by a primary source within thirty seconds. If I make a number up, I take it down. If I write a sentence I couldn't back up to a journalist, I rewrite it.
This is not because I'm afraid of being challenged. It's because I'm afraid of not being trusted.
A reader's bullshit detector runs in the background of every visit. They don't always know what's setting it off. They just leave. The vague hero, the unsourced statistic, the trusted by leading companies with no logos, the millions of users with no number. Every one of them costs trust quietly.
Defendable copy reads slower. It uses smaller numbers. It names specific things. It admits the boundaries of the claim. Used by 47 teams in healthcare beats Trusted by leading enterprises every single time, because one is a sentence you could repeat to a journalist and the other is a sentence you'd have to walk back.
The 30-second test:
Read the line. Imagine someone asking, based on what? If you can answer in thirty seconds with a specific source, ship the line. If you can't, cut it or rewrite it until you can.
The honest claim is almost always quieter than the impressive one. That's the whole point. It's also the only one anyone's going to believe in five years.
Marketing copy that survives audits compounds. The other kind quietly bleeds you out.