1) COMPLETE E-BIKES, where you get a complete e-bike, partly disassembled, so it can be shipped in two boxes. Advantages: You have everything figured out, everything fits and in the end the cost is usually lower than if you assemble the same bike bit by bit; But: There's not much building involved (apart form the basic bicycle assembly). So if you take pleasure in building things from scratch, this option is not best for you.
2) E-BIKE CONFIGURATOR, where you choose to take an e-bike without some essential parts, such as the battery pack, controller etc. Advantages: In the e-bike configurator you can take an almost complete bike, with many components and parts already fitted and assembled, but exclude the essential part, you have special plans with. Some builders prefer to build their own battery packs, or use a controller they already own; The configurator enables you to semi-build your e-bike - take a rolling chassis, for example, and add your own electrics. But: If you exclude an essential part of your e-bike, you will need to source and figure out that part yourself.
3) DIY PARTS, where you pick and choose all the components yourself; Advantages: This option, DIY components shop, is meant for the true e-bike builders with a lot of knowledge, time and resources. And especially with a vision of their own custom e-bike already clearly in mind. But: You won't find every e-bike component in the web-store available individually (for example battery pack) as we have them made for our bike set-ups specifically. So if you'll take individual parts from the shop, you might have to search for other sources.
Before you choose an option, it's best to know how much effort and time you're willing to put in your build and the extend of your e-bike knowledge.