I can earn 5-6 percent annual return with USDT, which is not possible with the foreign currency i keep in the bank. Yes, although usdt has some risks (your money is not in the bank after all and it is all about trust in the stock market), if you are in a place with high inflation and do not want to experience a negative situation against sudden exchange rate changes, you can choose usdt. If your priority is pure security, then keep your savings in the bank.
But USDT cannot be safer than USD and as I know all banks have USD savings accounts for anyone who needs one. Why don't you choose USD?
USDT is pegged to USD and sometimes there are incidents that lead to loss of peg such as dumping or manipulation in the cryptocurrency market. That's not foreign to us anymore, so holding all of our assets in USDT is actually much riskier than when our assets were in USD. Personally, I prefer USD if forced to choose one of these two assets.
USDT cannot be more stable than the dollar, for one simple reason - the stability of an object cannot be higher than what its stability provides !
It is like in reliability theory - the overall reliability of a system is the product of the reliability of its nodes.
Therefore, the very question of what is more reliable than USDT or Dollar (leaving aside the topic of the essence of the question - storage in the bank), does not make sense, because the dollar is 100% guaranteed to be secured by itself, and the stablecoin is not guaranteed to be secured by these very dollars.