I trust Usdt more, it still exists despite all the courts and claims. But at the same time, busd deserves attention, because the binance exchange trustworthy.
As far as USDT is concerned, the court cases are not settled and their funds can be seized (although the possibility of that happening is very low). Till now they have refused a third party audit on their reserves. Also, they have refused to provide a detailed breakup of the reserve funds. All we know is that around 49% of the reserves is made of "commercial paper". Now this commercial paper can be from trustworthy companies, or from shady entities. Since they are refusing to provide a detailed breakup, I would assume that it is the latter case.
Very possible that it's from dummy entities, if they are not hiding anything it's easy for them
to allow third party company to audit their reserves but until to date there's nothing that happen with that call.
In this particular topic it's answerable by those end users who value their money, people who already understand
both coins and enjoy the transactions that they've made using this two stable asset.
the advantage depends from how the end users define the very use of every projects.