Different contexts have different attention spans and character limits. A bio needs 10 words, an about page can hold a paragraph — the core idea should stay identical across all of them.
As specific and measurable as possible. "Feel more confident" is weaker than "land their first paying client in 30 days" because the second one is provable and memorable.
Pick one as your primary and test it consistently for a few months. Rotating taglines constantly prevents any of them from becoming recognizable.