USDT is the leading stablecoin in this market, and its 24h volume is even higher than bitcoin. So why do you doubt it? If you don't trust USDT, I think you shouldn't trust any other project, even bitcoin. You should leave this market as soon as possible if you dont trust this market
Well, actually, crypto should be a trustless system so users shouldn't have to trust no one. When you have a centralized crypto project (like Tether), then users must trust the team behind the project. That trust is (at least for me) broken for Tether. True, all stablecoin pairs have the best volume with Tether, but I would never leave my money in Tether for the long period.
I trust USDC and I use it as my favorite stablecoin. True, it is another centralized system, but they have monthly audits that show that they really have $ in the amount of USDC.