Don’t guess which version is better. Test it. Almost every big company has a team that does only this—they do experiments on the website to determine what works and what doesn’t. You can do this as well. Nowadays, with services like Optimizely, it’s relatively easy to find out which headline is or version is better.
Select the software that you want to use for your A/B testing.
Two popular solutions are Optimizely and Visual Website Optimizer.
Brainstorm with your team about what could improve your service.
Do experiments on headlines, buttons, forms, and other important elements.