I have been using Trustwallet for a long time and have not had any problems with it. I use it because it is simply a multichain wallet, very convenient for storing multiple coins at the same time and managing seed phrases is also easier. For now, everything is fine with Trustwallet but it is difficult to say what will happen in the next 2 years, it is a non-custodial but closed-source wallet so in my opinion it should not be chosen for long-term bitcoin storage. If you don't like using hardware wallet, you can use Electrum which is the software wallet in my opinion the safest and easiest to use but it doesn't support altcoins, so you need another wallet to store USDT.