I've been using Magento since the first beta of the first version (Magento 1.0). Back then when it was released I had several websites using osCommerce. A lot of websites were using osCommerce. I was a complete fan from the very begining because it was really more powerfull than all ecommerce scripts we had back then. We are in 2022 and Magento 2 is still the most powerfull ecommerce script available. Version 2.4.4 which will be released next month (March 8) looks very promissing.
Shopify is also great but it's hosted so you have no real control which is annoying if you like to customize a lot.