REST vs JS API for Quiz data

We're adding a quiz to our website which will accept about 10 data points from the user and then we would like to post this data to Marketo. The quiz will end with a form which the user will submit after entering name, email, etc. Should I be using the REST API or the Javascript API to submit this data? We want to avoid any potential DoS attacks, so I was leaning toward JS API with hidden fields. Thanks