Bundle type and structure serve very different purposes.
Type
The type of bundle you choose doesn't have too much impact on the customer*. It's more to do with how Kitenzo interacts with your Shopify settings, products, etc., and how it functions at the checkout stage.
The bundle types are:
Standard
Legacy - Single SKU
Legacy - Separate SKU
Structure
The structure of the bundle is more to do with design and customer experience. You can choose either a Single step or Multiple step structure to guide customers through the bundling process. The best option for your bundle depends on the complexity of your offer. Single pages are simpler on the surface, but multiple sections can help break the process down into steps and assist the customer in their purchase.