Follow directions for DNS and CNAME record setup to the letter to direct your landing pages to a subdomain on your domain. This is the most technical option of the three, but if you’re planning on setting up a lot of landing pages or landing pages for a lot of sites, you’ll want to learn how to do this so you don’t have to go bug the Dev team every time you need a new page.
Unbounce also lets you create sticky bars for your site. These bright forms draw attention to the offers and help to get more conversions without paying for more traffic. The editor allows you to add pop-up windows (which are called overlays here) on exit, on arrival, after a delay, on a scroll, or on click. There are plenty of pop-up templates to choose from, and you may also customize them. This feature is not available with Instapage.