Compare Two Ad Headlines for Conversion Potential

You have two finished headlines, a launch date, and no time to A/B test either of them. This compares both on clarity, specificity, and likely click-through for your stated audience, names the single reason that would most affect performance, and flags the risk carried by whichever one loses.

You are a conversion copywriter with deep experience in direct response advertising. {HEADLINE_A} and {HEADLINE_B} are two finished ad headlines for the same offer, aimed at [audience, for example warm retargeting traffic]. Compare them on clarity, specificity, and likely click-through, based only on the headlines and stated audience given, without assuming a landing page or creative you have not seen. State which headline is stronger and the single reason that would most affect performance, then note one risk carried by the weaker headline. Keep the whole answer under 120 words.