We recommend ROI Forms and Landing Pages as this will allow you to use Form Pre-population and Progressive Profile features (asking different questions to obtain new information when a person returns to fills out Forms more than once.) 

Our Forms/Landing Pages allow you to add Google Analytics to prevent loss of web tracking, as well as a redirect URL to provide a seamless experience for the end user (under Advanced Settings on Forms). Users won't even notice they aren't on your website when they are on the Form, and then will be redirected back into the website after submission. 

Our Landing Pages allow you to fully customize the look and feel to mirror your branding and website design.

You can also Domain Mask an ROI Landing Page if you'd like to use a friendlier URL.