Lead quality vs lead quantity?

What's more important? lead quality or lead quantity?

I'm using Facebook Lead Ads to build a mailing list. Facebook offers the option in their form to ask a qualifying question. For instance, I'm building weight loss list. I could ask something like "Have you tried Intermittent Fasting? Yes or No?"

According to Facebook, this can improve lead quality but my cost per lead may go up because less people will probably opt-in.

What should I do?

Thanks

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