Initially I was comfortable using USDT but after a lot of issues and lack of transparency I switched to BUSD and sometimes I use USDC, if USDT was more transparent about auditing I think it would be better
USDC is one of the most familiar stable coin in the space, and I bet USDC will always be use to swap coins. USDC is equivalent to the dollar rate and works with the stocks market. BUSD is also a stable coin that's mostly used by these Crypto exchanges, but i prefer USDC to BUSD because USDC is serving as the general stable which we used to pay off transactions fees. As for USDT, although it serves also as USDC but with a quite difference.