We started with popups as they are the highest intent portion of the journey, these are still our bread and butter. These are the highest impact data collection point.
We also do quizzes, but rather than provide a list of products at the end we advise brands to instead built contextual landing pages telling quiz takers why they selected the products they did for them based on their answers. From our experience far too often the quiz experience seeks to diagnose versus allow discovery within a range of products.
We also do post purchase surveys, this allows us to unify the data across all zero party data collection touchpoints.
For a full view of how all these things work, check out our store at formtoro.myshopify.com