Which one is safer, USDT or USDC?

Could you please explain which of the two cryptocurrencies, USDT or USDC, is considered safer? I've heard differing opinions on their stability and trustworthiness, and I'm trying to make an informed decision. Could you outline the key factors that affect their safety, such as the issuer's credibility, collateralization, and regulatory oversight? Additionally, it would be helpful if you could compare their market capitalization and trading volume to assess their liquidity and popularity. Thank you for your assistance in clarifying this matter.