Online shop. Which tool should I use?

I also recommend Woocommerce. It is simple and easier to use and manage compared to other platforms like Magento or others

Personally, I’d go the route of least resistance and choose tools you are most familiar with. I’ve been building with WordPress for a decade, so I tried two plugins to handle the transaction functionality. Finding the cheapest solution shouldn’t be the biggest deciding factor. I chose WooCommerce, free, and spent much longer configuring it to how I wanted... and will likely end up paying for a few expensive extensions to make it work even better. Where as I used a more specific plugin for another project that took much less dev time, but started with a $99/yr price tag, both options with stripe. Point being, don’t get stuck on the tech, and worry more on the actual product and marketing. Once, you are making enough that 15% fee really hurts too much, it will be worth it to upgrade the experience.