Hey Val,
It's really dependent on the requirements you have. Forms 2.0 forms will only post directly to a marketo instance, so if you have a requirement for data to go to one of your own servers in addition to send to Marketo, this may not be the best course of action. You can create custom code for your pages to make ajax requests during submission via the Forms 2.0 API(http://developers.marketo.com/documentation/websites/forms-2-0/), but that will require custom implementation in addition to the embed code itself.