As far as I know investors don't have two things in trading, what they have is two ways investors trade.
1. Bitcoin
2. USDT.
Speaking of trust, what is certain is that investors have their own beliefs to trade Bitcoin of their choice and usdt as well as their choice, fact, if rich investors already know about Bitcoin they will leave usdt.
Bitcoin trading is much more profitable than USDT, in the current situation, I think investors trust Bitcoin more than USDT, If it is explained here why they believe in Bitcoin, it may take two pages, the point is: investors believe in Bitcoin more, usdt only as a means or bridge to cross.
I disagree with this, people trust way more than just btc and usdt, they trust altcoins as well. By the looks of it they unfortunately trust in wrong things as well, they are trusting like apecoin or whatever these days for example, they did that to doge and shiba at one point as well.
I am not saying that they are trusting in the great altcoins and doing awesome, they are sometimes trusting into the horrible stuff as well but that doesn't mean that they do not trust other stuff. Obviously, the most trusted ones are btc and usdt and I agree with that. However "the most trusted" and "only trusting" are different things. They do trust btc and usdt the most, but they also trust other coins as well.