PPC/Facebook Ads: Send buyers to landing page or IDX?

[Carl Ohai]

Suppose you are trying to target buyers with Facebook ads and Google AdWords. What's better: to send them to a conversion-rate-optimized "agent-focused" landing page, or to send them to an IDX?

The IDX would have the benefit of allowing buyers to contact the agent about the specific homes for sale, while the agent-focused site would better highlight the agent him/herself

Any input on this?