I think the stablecoin I have trusted is USDT because USDT is still in the top 3 based on coinmarketcap...
The large capitalization of a stablecoin cannot be a guarantee of its security. After all, any issuer of a stablecoin can print an unlimited amount of its stablecoin, which can increase its capitalization several times at once. Here, the reliability of the issuer behind this stable coin is more important, and what reserve assets are used and their quantity to support a stable exchange rate.
Though capitalization is a big thing, I can say that its also important to have that reserve assets just in case something bad happen in their network. Many learned the lesson from what happened in LUNA, that’s why there’s a trust issues with the stablecoins already, but for me USDC and BUSD are still good, they have a good amount of reserve which is enough to give assurance to their hodlers. I often used BUSD since I trade on Binance and there’s a lot of pairs under this stablecoin, just use what’s convenient for you but remember to stay cautious and be alert of what’s happening in the market, especially with those stablecoins.