Hi Veerle De Ridder,
Best way to do this is as follows:
1. Create a Contact field that is of type Multi-Select which populates list of all asset types. (You can always use the list and append or delete an item on the list to keep up to date as your campaign changes, if at all.
2. Create ADC component for each asset type.
3. Insert all ADC components in the email/landing page.
4. Drive the rules on ADC component based on values that are on the multi-select field.
Multi-select field give you the option to either have contact select one or more than one asset URL's they are interested in.
Email/Landing page, which even though has all ADCs, will only populate URL's for one contact selected from the initial form.
Hope this helps.
In case any questions, feel free to reach out.
Thank you
Amit Pandya