Positive or negative wording for webinar

I am planning to set up a free webinar to promote a group program. It’s my first time doing this.

I’m toying with different titles for my webinar, and I’m wondering if I should frame the topic positively (“how to achieve X result”) or negatively (“how to avoid X problem”).

In your experience, is there a difference in conversion between those two options?

Would it make sense to assess the difference by running two Facebook ads using one or the other title, but then all registered participants would attend the same webinar? Or would that be confusing?

Thanks in advance for your advice!