At the start you decide on the platform — it determines how much the e-shop will cost, how fast you launch it and how far it can grow. The wrong choice will cost you tens of thousands when, after a year, you find out you need more than the platform can do.
Shoptet is the king of the Czech market — perfect for small and medium Czech e-shops, with integrations for Heureka, Zbozi.cz, carriers and invoicing in the Czech Republic. Shopify is the global leader — multi-currency, multi-language, easy cross-border selling. Custom React/Next.js is for companies with B2B processes, unique workflows or extreme volume.
If you don't know which way to go, give me a call. After a 15-minute conversation I usually know which platform suits you. And if I find that none of mine fits, I'll say so openly — maybe you need WooCommerce or Magento, and I'll recommend someone else.