Where should I do an eCommerce that will contain millions of variation combinations?

Question

I am creating a project for a client, who wants to sell servers online. These are two reference pages, we want to create something just like these ones:

https://www.savemyserver.com/

https://www.theserverstore.com/dell-poweredge-r730xd-sff-24x-server-w-nvme.html

They load very fast and contain millions of possible combinations to customize the type of server clients buy. That is what we want to do.

My question is: Where should I do this project?

• Woocommerce?
• Shopify
• Code core with developers?

Can you tell me where these reference sites were made on?

Thanks a lot!