but more secure and transparent, the difference is only in the smart contract platform.
USDT, DAI or USDC may look different, but they function the same.
It only varies on which network they are connected to but all are pegged to US$. So if you are trying to use any one of them, you need to be careful to which network they are connected with because wrong address and you will not recover your funds. Supposedly, they have backing of real assets, but don't know the absolute truth about their claims.