No one mention one of the cheapest transaction fee and fast network right now.
Solana network. There are a lot of stablecoins right now on Solana, such as USDC, USDT, UST, etc. You will just select what you will use because you are in Solana networks and those stablecoins are SPL20 tokens (the equivalent of ERC20 on Ethereum, e.g. USDT).