Hi,

We are trying to put together a join registration form for our business that will have the information for the customer stored in Salesforce.  The process the customer goes through is quite extensive and 9 times out of 10 would need to log into the registration form at a later date to complete it.  

We are looking at implementing  this in one of two ways, the first is to do this in a Force.com site that would load the customer details and save everything in an account/opportunity object, the downside we see with this is the restrictions with the design side of it.  The alternative is to write the application in ASP.NET and save/load the details through the Salesforce API, concerned about the time it takes to save through the API.  In the past we have developed in both so this is not an issue.

What are peoples thoughts? Which is the better more robust solution a Force.com site or writing the Salesforce API?

Thank you in advance for your advice,

-Jason