Currently, USDT daily trading volume is over the Bitcoin trading volume and fourth highest market cap according to Coinmarketcap. My opinion is We can't trust the centralized stable coin to keep the money. Also, news around the USDT is not good, and it may be shut down by the authorities.

What is your opinion about the USDT coin?

I use the DAI to keep the stable value & will shift to the SAI in the near future where the money I'm not investing.