USDC is better than USDT. But USDC is most commonly used by institutions in the United States (or where Coinbase is offered in other countries). If your customers are businesses, then you will likely want to use USDC to send invoices to your customers. If you're a Gilded user working with Gilded's Coinbase integration, it makes sense to use USDC. On the other hand, USDT is most commonly used by traders and investors. Tether is a tool that allows traders to protect profits and stay in crypto. It allows you to keep your money on exchanges without subjecting yourself to volatile bitcoin prices. If your customers are traders, then perhaps USDT is the right choice.