Should I send ad traffic to a funnel or a simple landing page?

If you are offering a straight trial, a landing page with a sign up form is enough. If you want something like our challenge, with a landing page and upsell pages, build it in the funnel builder.

A funnel gives you reporting on each step, lets you compare different landing pages, and lets you build automations in the same place. The visitor ID feature identifies visitors who leave without finishing, and you can send them abandoned cart emails.