Answer three questions to see a practical starting structure - US LLC, Delaware C corporation, UK Ltd, or a local company.
What actually drives the choice
Four things decide the structure more than filing price: where you live and manage the company, where your customers are, whether you will raise venture capital, and your banking and payment eligibility. Investors expect a Delaware C corporation; a UK resident usually belongs in a UK Ltd; a non-resident chasing US Stripe usually lands on a US LLC.
Whatever this tool suggests, confirm the home-country tax treatment before you form - the same entity can be taxed very differently depending on where you are resident.