Marketo has several AB testing features out of the box. You can check them out here(https://community.marketo.com/MarketoArticle?id=kA050000000LC8FCAW) and here(https://community.marketo.com/MarketoArticle?id=kA050000000LGT0CAO).
Thanks. Would you say there are any significant limitations to Marketo's testing capabilities or all good? We're determining whether to use Marketo or Wordpress for our landing pages, and one consideration is our ability to run tests with Unbounce (on our website landing pages) vs Marketo (on Marketo landing pages).
Never tried Unbounce, but Marketo's landing page A/B testing functionality should be sufficient for most users. Most of the testing is reporting-based anyway, so there will be some custom setup involved.