I believe TUSD more than USDT, even though the ranking shows that USDT is most popular but I don't know whether you know it or not but there are many conspiracy theories as well as confusion on how much % of USD is pegged for the coin. TUSD is 100% pegged so I would trust it more than USDT but there are many exchanges that give nice returns for holding USDT. Personally, I don't hold anything in both of them but I would prefer TUSD more than USDT.
at first I also questioned this but there were those who answered that in 100% backup there were those who denied it, so I still use it because usdt is the most popular stable coin, even if it will be a scam I don't really mind it because there are still other stable coin options, and so far no problem about USDT till now.